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<title>Cross Session Events :: AL Guidelines</title>
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ALGuidelines.Dev
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<li data-nav-id=/welcome/ title=Welcome class=dd-item><a href=/welcome/><b><i class="fas fa-home"></i> </b>Welcome</a><ul></ul></li>
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<li data-nav-id=/bcpatterns/ title="BC Patterns" class=dd-item><a href=/bcpatterns/><b><i class="fas fa-clone"></i> </b>BC Patterns</a><ul>
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<li data-nav-id=/bcpatterns/facade-pattern/ title="Facade Pattern" class=dd-item><a href=/bcpatterns/facade-pattern/>Facade Pattern</a></li>
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<li data-nav-id=/bcpatterns/generic-method-pattern/ title="Generic Method Pattern" class=dd-item><a href=/bcpatterns/generic-method-pattern/>Generic Method Pattern</a></li></ul></li>
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<li data-nav-id=/bcbestpractices/ title="BC Dev. Best Practices" class=dd-item><a href=/bcbestpractices/><b><i class="fas fa-medal"></i> </b>BC Dev. Best Practices</a><ul>
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<li data-nav-id=/bcbestpractices/readability/ title=Readability class=dd-item><a href=/bcbestpractices/readability/>Readability</a><ul>
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<li data-nav-id=/bcbestpractices/readability/begin-as-an-afterword/ title="begin as an 'After Word'" class=dd-item><a href=/bcbestpractices/readability/begin-as-an-afterword/>begin as an 'After Word'</a></li>
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<li data-nav-id=/bcbestpractices/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/bcbestpractices/readability/begin-end/>Begin-End - Compound Only</a></li>
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<li data-nav-id=/bcbestpractices/readability/binary-operator-line-start/ title="Binary Operator to Start Line" class=dd-item><a href=/bcbestpractices/readability/binary-operator-line-start/>Binary Operator to Start Line</a></li>
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<li data-nav-id=/bcbestpractices/readability/case-actions/ title="CASE Action on next line" class=dd-item><a href=/bcbestpractices/readability/case-actions/>CASE Action on next line</a></li>
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<li data-nav-id=/bcbestpractices/readability/comments-spacing/ title="Comment Spacing" class=dd-item><a href=/bcbestpractices/readability/comments-spacing/>Comment Spacing</a></li>
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<li data-nav-id=/bcbestpractices/readability/end-else-pair/ title="end else pair" class=dd-item><a href=/bcbestpractices/readability/end-else-pair/>end else pair</a></li>
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<li data-nav-id=/bcbestpractices/readability/keyword-pairs-indentation/ title="Keyword Pairs - Indentation" class=dd-item><a href=/bcbestpractices/readability/keyword-pairs-indentation/>Keyword Pairs - Indentation</a></li>
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<li data-nav-id=/bcbestpractices/readability/line-start-keywords/ title="Line Start Keywords" class=dd-item><a href=/bcbestpractices/readability/line-start-keywords/>Line Start Keywords</a></li>
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<li data-nav-id=/bcbestpractices/readability/lonely-repeat/ title="Lonely Repeat" class=dd-item><a href=/bcbestpractices/readability/lonely-repeat/>Lonely Repeat</a></li>
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<li data-nav-id=/bcbestpractices/readability/named-invocations/ title="Named Invocations" class=dd-item><a href=/bcbestpractices/readability/named-invocations/>Named Invocations</a></li>
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<li data-nav-id=/bcbestpractices/readability/one-statement-per-line/ title="One Statement Per Line" class=dd-item><a href=/bcbestpractices/readability/one-statement-per-line/>One Statement Per Line</a></li>
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<li data-nav-id=/bcbestpractices/readability/separate-if-and-else/ title="Separate if and else" class=dd-item><a href=/bcbestpractices/readability/separate-if-and-else/>Separate if and else</a></li>
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<li data-nav-id=/bcbestpractices/readability/spacing-binary-operators/ title="Spacing Binary Operators" class=dd-item><a href=/bcbestpractices/readability/spacing-binary-operators/>Spacing Binary Operators</a></li>
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<li data-nav-id=/bcbestpractices/readability/suggested-abbreviations/ title="Suggested Abbreviations" class=dd-item><a href=/bcbestpractices/readability/suggested-abbreviations/>Suggested Abbreviations</a></li>
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<li data-nav-id=/bcbestpractices/readability/unnecessary-else/ title="Unnecessary 'else'" class=dd-item><a href=/bcbestpractices/readability/unnecessary-else/>Unnecessary 'else'</a></li>
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<li data-nav-id=/bcbestpractices/readability/unnecessary-truefalse/ title="Unnecessary true/false" class=dd-item><a href=/bcbestpractices/readability/unnecessary-truefalse/>Unnecessary true/false</a></li>
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<li data-nav-id=/bcbestpractices/readability/variable-naming/ title="Variable Naming" class=dd-item><a href=/bcbestpractices/readability/variable-naming/>Variable Naming</a></li>
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<li data-nav-id=/bcbestpractices/readability/variables-declarations-order/ title="Variables Declarations Order" class=dd-item><a href=/bcbestpractices/readability/variables-declarations-order/>Variables Declarations Order</a></li></ul></li></ul></li>
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<li data-nav-id=/navpatterns/ title="NAV Patterns Archive" class="dd-item parent"><a href=/navpatterns/><b><i class="fas fa-save"></i> </b>NAV Patterns Archive</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/ title="1. Patterns" class="dd-item parent"><a href=/navpatterns/1-patterns/>1. Patterns</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/activity-log/ title="Activity Logs" class=dd-item><a href=/navpatterns/1-patterns/activity-log/>Activity Logs</a></li>
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<li data-nav-id=/navpatterns/1-patterns/argument-table/ title="Argument Table" class=dd-item><a href=/navpatterns/1-patterns/argument-table/>Argument Table</a></li>
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<li data-nav-id=/navpatterns/1-patterns/blocked-entity/ title="Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/>Blocked Entity</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/ title="Data Driven Blocked Entity" class=dd-item><a href=/navpatterns/1-patterns/blocked-entity/data-driven-blocked-entity/>Data Driven Blocked Entity</a></li></ul></li>
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<li data-nav-id=/navpatterns/1-patterns/cached-web-service-calls/ title="Cached Web Server Calls" class=dd-item><a href=/navpatterns/1-patterns/cached-web-service-calls/>Cached Web Server Calls</a></li>
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<li data-nav-id=/navpatterns/1-patterns/conditional-cascading-update/ title="Conditional Cascading Update" class=dd-item><a href=/navpatterns/1-patterns/conditional-cascading-update/>Conditional Cascading Update</a></li>
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<li data-nav-id=/navpatterns/1-patterns/copy-document/ title="Copy Document" class=dd-item><a href=/navpatterns/1-patterns/copy-document/>Copy Document</a></li>
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<li data-nav-id=/navpatterns/1-patterns/create-data-from-templates/ title="Create Data from Templates" class=dd-item><a href=/navpatterns/1-patterns/create-data-from-templates/>Create Data from Templates</a></li>
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<li data-nav-id=/navpatterns/1-patterns/create-urls-to-nav-clients/ title="Create URLs to NAV Clients" class=dd-item><a href=/navpatterns/1-patterns/create-urls-to-nav-clients/>Create URLs to NAV Clients</a></li>
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<li data-nav-id=/navpatterns/1-patterns/creating-custom-charts/ title="Creating Custom Charts" class=dd-item><a href=/navpatterns/1-patterns/creating-custom-charts/>Creating Custom Charts</a></li>
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<li data-nav-id=/navpatterns/1-patterns/cross-session-events/ title="Cross Session Events" class="dd-item active"><a href=/navpatterns/1-patterns/cross-session-events/>Cross Session Events</a></li>
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<li data-nav-id=/navpatterns/1-patterns/currently-active-record/ title="Currently Active Record" class=dd-item><a href=/navpatterns/1-patterns/currently-active-record/>Currently Active Record</a></li>
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<li data-nav-id=/navpatterns/1-patterns/data-migration-facade/ title="Data Migration Façade" class=dd-item><a href=/navpatterns/1-patterns/data-migration-facade/>Data Migration Façade</a></li>
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<li data-nav-id=/navpatterns/1-patterns/discovery-event/ title="Discovery Event" class=dd-item><a href=/navpatterns/1-patterns/discovery-event/>Discovery Event</a></li>
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<li data-nav-id=/navpatterns/1-patterns/document/ title=Document class=dd-item><a href=/navpatterns/1-patterns/document/>Document</a></li>
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<li data-nav-id=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/ title="Easy Update Of Setup Or Supplementary Information" class=dd-item><a href=/navpatterns/1-patterns/easy-update-of-setup-or-supplementary-information/>Easy Update Of Setup Or Supplementary Information</a></li>
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<li data-nav-id=/navpatterns/1-patterns/error-message-processing/ title="Error Message Processing" class=dd-item><a href=/navpatterns/1-patterns/error-message-processing/>Error Message Processing</a></li>
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<li data-nav-id=/navpatterns/1-patterns/extending-the-role-center-headlines/ title="Extending the Role Center Headlines" class=dd-item><a href=/navpatterns/1-patterns/extending-the-role-center-headlines/>Extending the Role Center Headlines</a></li>
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<li data-nav-id=/navpatterns/1-patterns/feature-localization-for-data-structures/ title="Feature Localization For Data Structures" class=dd-item><a href=/navpatterns/1-patterns/feature-localization-for-data-structures/>Feature Localization For Data Structures</a></li>
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<li data-nav-id=/navpatterns/1-patterns/hooks/ title=Hooks class=dd-item><a href=/navpatterns/1-patterns/hooks/>Hooks</a></li>
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<li data-nav-id=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/ title="Surrogate keys using Autoincrement Pattern" class=dd-item><a href=/navpatterns/1-patterns/implementation-of-surrogate-keys-using-autoincrement-pattern/>Surrogate keys using Autoincrement Pattern</a></li>
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<li data-nav-id=/navpatterns/1-patterns/instructions-in-the-ui/ title="Instructions in the UI" class=dd-item><a href=/navpatterns/1-patterns/instructions-in-the-ui/>Instructions in the UI</a></li>
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<li data-nav-id=/navpatterns/1-patterns/integration-of-addresses/ title="Integration of Addresses" class=dd-item><a href=/navpatterns/1-patterns/integration-of-addresses/>Integration of Addresses</a></li>
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<li data-nav-id=/navpatterns/1-patterns/journal-error-processing/ title="Journal Error Processing" class=dd-item><a href=/navpatterns/1-patterns/journal-error-processing/>Journal Error Processing</a></li>
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<li data-nav-id=/navpatterns/1-patterns/journal-template-batch-line/ title="Journal Template Batch Line" class=dd-item><a href=/navpatterns/1-patterns/journal-template-batch-line/>Journal Template Batch Line</a></li>
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<li data-nav-id=/navpatterns/1-patterns/master-data/ title="Master Data" class=dd-item><a href=/navpatterns/1-patterns/master-data/>Master Data</a></li>
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<li data-nav-id=/navpatterns/1-patterns/multi-file-download/ title="Multi-file Download" class=dd-item><a href=/navpatterns/1-patterns/multi-file-download/>Multi-file Download</a></li>
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<li data-nav-id=/navpatterns/1-patterns/multi-page-list/ title="Multi-Page List" class=dd-item><a href=/navpatterns/1-patterns/multi-page-list/>Multi-Page List</a></li>
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<li data-nav-id=/navpatterns/1-patterns/multilanguage-application-data/ title="Multilanguage Application Data" class=dd-item><a href=/navpatterns/1-patterns/multilanguage-application-data/>Multilanguage Application Data</a></li>
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<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/ title="NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/>NET Exception Handling in CAL</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/ title="TryFunction NET Exception Handling in CAL" class=dd-item><a href=/navpatterns/1-patterns/net-exception-handling-in-cal/tryfunction-net-exception-handling-in-cal/>TryFunction NET Exception Handling in CAL</a></li></ul></li>
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<li data-nav-id=/navpatterns/1-patterns/no-series/ title="No Series" class=dd-item><a href=/navpatterns/1-patterns/no-series/>No Series</a></li>
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<li data-nav-id=/navpatterns/1-patterns/notifications/ title=Notifications class=dd-item><a href=/navpatterns/1-patterns/notifications/>Notifications</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/notifications/in-context-notifications/ title="In-context Notifications" class=dd-item><a href=/navpatterns/1-patterns/notifications/in-context-notifications/>In-context Notifications</a></li>
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<li data-nav-id=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/ title="Notification Lifecycle Management Pattern" class=dd-item><a href=/navpatterns/1-patterns/notifications/notification-lifecycle-management-pattern/>Notification Lifecycle Management Pattern</a></li></ul></li>
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<li data-nav-id=/navpatterns/1-patterns/observer/ title=Observer class=dd-item><a href=/navpatterns/1-patterns/observer/>Observer</a></li>
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<li data-nav-id=/navpatterns/1-patterns/posting-routine-select-behavior/ title="Posting Routine - Select Behavior" class=dd-item><a href=/navpatterns/1-patterns/posting-routine-select-behavior/>Posting Routine - Select Behavior</a></li>
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<li data-nav-id=/navpatterns/1-patterns/product-name/ title="Product Name" class=dd-item><a href=/navpatterns/1-patterns/product-name/>Product Name</a></li>
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<li data-nav-id=/navpatterns/1-patterns/queries/ title=Queries class=dd-item><a href=/navpatterns/1-patterns/queries/>Queries</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/queries/select-distinct-with-queries/ title="SELECT DISTINCT with Queries" class=dd-item><a href=/navpatterns/1-patterns/queries/select-distinct-with-queries/>SELECT DISTINCT with Queries</a></li>
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<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/ title="Use Queries to Detect Duplicate Records" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-detect-duplicate-records/>Use Queries to Detect Duplicate Records</a></li>
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<li data-nav-id=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/ title="Use Queries to Replace Nested Loops" class=dd-item><a href=/navpatterns/1-patterns/queries/use-queries-to-replace-nested-loops/>Use Queries to Replace Nested Loops</a></li></ul></li>
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<li data-nav-id=/navpatterns/1-patterns/read-once-initialization-and-validation/ title="Read-once Initialization and Validation" class=dd-item><a href=/navpatterns/1-patterns/read-once-initialization-and-validation/>Read-once Initialization and Validation</a></li>
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<li data-nav-id=/navpatterns/1-patterns/released-entity/ title="Released Entity" class=dd-item><a href=/navpatterns/1-patterns/released-entity/>Released Entity</a></li>
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<li data-nav-id=/navpatterns/1-patterns/report-selection/ title="Report Selection" class=dd-item><a href=/navpatterns/1-patterns/report-selection/>Report Selection</a></li>
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<li data-nav-id=/navpatterns/1-patterns/security/ title=Security class=dd-item><a href=/navpatterns/1-patterns/security/>Security</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/security/1-sensitive-data-encapsulation/ title="Sensitive Data Encapsulation" class=dd-item><a href=/navpatterns/1-patterns/security/1-sensitive-data-encapsulation/>Sensitive Data Encapsulation</a></li>
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<li data-nav-id=/navpatterns/1-patterns/security/2-data-encryption/ title="Data Encryption" class=dd-item><a href=/navpatterns/1-patterns/security/2-data-encryption/>Data Encryption</a></li>
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<li data-nav-id=/navpatterns/1-patterns/security/3-single-point-of-access/ title="Single Point of Access" class=dd-item><a href=/navpatterns/1-patterns/security/3-single-point-of-access/>Single Point of Access</a></li>
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<li data-nav-id=/navpatterns/1-patterns/security/4-masked-text/ title="Masked Text" class=dd-item><a href=/navpatterns/1-patterns/security/4-masked-text/>Masked Text</a></li>
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<li data-nav-id=/navpatterns/1-patterns/security/5-ssl-in-nav/ title="SSL in NAV" class=dd-item><a href=/navpatterns/1-patterns/security/5-ssl-in-nav/>SSL in NAV</a></li></ul></li>
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<li data-nav-id=/navpatterns/1-patterns/setup-specificity-fallback/ title="Setup Specificity Fallback" class=dd-item><a href=/navpatterns/1-patterns/setup-specificity-fallback/>Setup Specificity Fallback</a></li>
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<li data-nav-id=/navpatterns/1-patterns/silent-file-upload-and-download/ title="Silent File Upload and Download" class=dd-item><a href=/navpatterns/1-patterns/silent-file-upload-and-download/>Silent File Upload and Download</a></li>
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<li data-nav-id=/navpatterns/1-patterns/singleton/ title=Singleton class=dd-item><a href=/navpatterns/1-patterns/singleton/>Singleton</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-codeunit/ title="Singleton Codeunit" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-codeunit/>Singleton Codeunit</a></li>
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<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/ title="Singleton Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/>Singleton Table</a><ul>
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<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/cue-table/ title="Cue Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/cue-table/>Cue Table</a></li>
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<li data-nav-id=/navpatterns/1-patterns/singleton/singleton-table/setup-table/ title="Setup Table" class=dd-item><a href=/navpatterns/1-patterns/singleton/singleton-table/setup-table/>Setup Table</a></li></ul></li></ul></li>
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<li data-nav-id=/navpatterns/1-patterns/standard-journal/ title="Standard Journal" class=dd-item><a href=/navpatterns/1-patterns/standard-journal/>Standard Journal</a></li>
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<li data-nav-id=/navpatterns/1-patterns/temporary-dataset-report/ title="Temporary Dataset Report" class=dd-item><a href=/navpatterns/1-patterns/temporary-dataset-report/>Temporary Dataset Report</a></li>
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<li data-nav-id=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/ title="Totals and Discounts on Subpages Sales and Purchases" class=dd-item><a href=/navpatterns/1-patterns/totals-and-discounts-on-subpages-sales-and-purchases/>Totals and Discounts on Subpages Sales and Purchases</a></li>
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<li data-nav-id=/navpatterns/1-patterns/transfer-custom-fields/ title="Transfer Custom Fields" class=dd-item><a href=/navpatterns/1-patterns/transfer-custom-fields/>Transfer Custom Fields</a></li>
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<li data-nav-id=/navpatterns/1-patterns/variant-facade/ title="Variant Facade" class=dd-item><a href=/navpatterns/1-patterns/variant-facade/>Variant Facade</a></li></ul></li>
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<li data-nav-id=/navpatterns/2-anti-patterns/ title="2. Anti-Patterns" class=dd-item><a href=/navpatterns/2-anti-patterns/>2. Anti-Patterns</a><ul>
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<li data-nav-id=/navpatterns/2-anti-patterns/nav-upgrade/ title="Nav Upgrade" class=dd-item><a href=/navpatterns/2-anti-patterns/nav-upgrade/>Nav Upgrade</a></li>
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<li data-nav-id=/navpatterns/2-anti-patterns/reusable-bugs/ title="Reusable Bugs" class=dd-item><a href=/navpatterns/2-anti-patterns/reusable-bugs/>Reusable Bugs</a></li></ul></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/ title="3. CAL Coding Guidelines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/>3. CAL Coding Guidelines</a><ul>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/ title=Design class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/>Design</a><ul>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/ title="By Reference Parameters" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/by-reference-parameters/>By Reference Parameters</a></li>
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<h1>Cross Session Events</h1>
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<p><em>By Nikolai L’Estrange, from TVision Technology Ltd. in the UK</em></p>
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<h2 id=abstract>Abstract</h2>
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<p>Track things that happen in other NAV Sessions.</p>
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<p><a href=PubSub.png><img src=PubSub.png alt=" "></a></p>
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<h2 id=problem>Problem</h2>
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<p>In Microsoft Dynamics NAV you can fire a function whenever something changes within your session (and from NAV 2016 this is even easier with the new Event model), however there is not an easy way to know what is happening in other sessions. Sometimes you would like to know what has happened since your last read, without reading everything again, e.g. when you need to pass a large dataset to a Control Add-in.</p>
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<p>A common way of handling this with Ledger Tables is to make note of the last record you read, and continuously poll to see if there are any new records. However this is restricted to strictly sequentially entered tables.</p>
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<h2 id=solution>Solution</h2>
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<p>There is a common pattern in many other languages called <a href=https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern>Publish-Subscribe</a> (or PubSub) that solves the same issue. We can implement the same pattern in NAV using a Table as a message queue platform and polling this table. We have named this pattern “Cross Session Events” in order to avoid confusion with the standard NAV Events which use the terms Publisher and Subscriber, and to try and describe more accurately when you would need this pattern.</p>
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<p>The pattern has four components:</p>
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<ul>
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<li><strong>Publisher(s)</strong>: These push messages to the Message Broker.</li>
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<li><strong>Subscriber Records</strong>: Identifies the Subscriber and store filters to say what messages the Subscriber and interested in receiving.</li>
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<li><strong>Message Broker</strong>: This distributes all messages sent in to all Subscribers that have expressed an interest (i.e. the message is within their filters).</li>
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<li><strong>Message Queue</strong>: To hold the messages for each Subscriber. Generally once these messages are read, they are deleted.</li>
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</ul>
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<h2 id=example>Example</h2>
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<p>An example of this would be when we have multiple users looking at the same set of data and we want their screens to update in “real time” whenever one of them makes a change, without doing a full refresh. We will use the <a href=/nav/w/designpatterns/248.observer>Observer pattern</a> to capture the change (act as the Publisher) and then create a Table to hold Subscribers and Filters (Change Observer), a Table to be the Message Queue (Change Notification), and a Codeunit to be the Message Broker and help with the polling (ObserverMgt).</p>
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<p>Below are the table definitions:</p>
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<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al> <span style=color:#75715e>//Change Observer:
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</span><span style=color:#75715e></span> <span style=color:#75715e>//"Table ID" Integer "Observable Table"
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</span><span style=color:#75715e></span> "Server ID" <span style=color:#66d9ef>Integer</span>
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"Session ID" <span style=color:#66d9ef>Integer</span>
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<span style=color:#75715e>//Change Notification:
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</span><span style=color:#75715e></span> <span style=color:#75715e>//"Table ID" Integer "Observable Table"
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</span><span style=color:#75715e></span> "Server ID" <span style=color:#66d9ef>Integer</span>
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"Session ID" <span style=color:#66d9ef>Integer</span>
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"Entry No." <span style=color:#66d9ef>Integer</span> AutoIncrement
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"Type of Change" <span style=color:#66d9ef>Option</span> Insert,<span style=color:#66d9ef>Modify</span>,Delete,Rename
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"Record ID" <span style=color:#66d9ef>RecordID</span>
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<span style=color:#f92672>... (</span>other <span style=color:#66d9ef>fields</span> <span style=color:#66d9ef>to</span> indicate what has changed<span style=color:#f92672>)
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</span></code></pre></div><p>The Change Observer table identifies the Subscriber using Server ID and Session ID, and then in this example there is only one filter, which is the Table ID we want to listen to any changes. In this case all three fields are in the Primary Key.</p>
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<p>The Change Notification table then has the same three fields plus an Entry No. as its Primary Key, and in this example borrows heavily from the Change Log code to fill in the rest of the message.</p>
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<p><em><strong>Note:</strong></em> Other examples of the pattern could have very different fields to identify the Subscriber, Filters and then whatever fields needed for content of the Message.</p>
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<p>Our Message Broker Codeunit will also serve as a central place to create Subscribers (Listen and StopListening functions) and a place to Poll for Messages. Note that the Poll function deletes the Messages as it reads them.</p>
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<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al> <span style=color:#75715e>//Listen(TableID : Integer)**
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</span><span style=color:#75715e></span> <span style=color:#66d9ef>WITH</span> Observer <span style=color:#66d9ef>DO</span> <span style=color:#66d9ef>BEGIN</span>
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"Table ID" <span style=color:#f92672>:=</span> TableID;
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"Server ID" <span style=color:#f92672>:=</span> SERVICEINSTANCEID;
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"Session ID" <span style=color:#f92672>:=</span> SESSIONID;
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INSERT<span style=color:#f92672>(</span>TRUE<span style=color:#f92672>)</span>;
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COMMIT;
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<span style=color:#66d9ef>END</span>;
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<span style=color:#75715e>//StopListening(TableID : Integer)
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</span><span style=color:#75715e></span> <span style=color:#66d9ef>WITH</span> Observer <span style=color:#66d9ef>DO</span> <span style=color:#66d9ef>BEGIN</span>
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RESET;
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SETRANGE<span style=color:#f92672>(</span>"Server ID",SERVICEINSTANCEID<span style=color:#f92672>)</span>;
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SETRANGE<span style=color:#f92672>(</span>"Session ID",SESSIONID<span style=color:#f92672>)</span>;
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SETRANGE<span style=color:#f92672>(</span>"Table ID",TableID<span style=color:#f92672>)</span>;
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DELETEALL<span style=color:#f92672>(</span>TRUE<span style=color:#f92672>)</span>;
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COMMIT;
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<span style=color:#66d9ef>END</span>;
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<span style=color:#75715e>//NotifyAll(ChangeNotification : Record "Change Notification")**
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</span><span style=color:#75715e></span> <span style=color:#66d9ef>WITH</span> Observer <span style=color:#66d9ef>DO</span> <span style=color:#66d9ef>BEGIN</span>
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RESET;
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SETRANGE<span style=color:#f92672>(</span>"Table ID",ChangeNotification<span style=color:#f92672>.</span>"Table ID"<span style=color:#f92672>)</span>;
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<span style=color:#66d9ef>IF</span> FINDSET <span style=color:#66d9ef>THEN</span> <span style=color:#66d9ef>REPEAT</span>
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Notify<span style=color:#f92672>(</span>Observer,ChangeNotification<span style=color:#f92672>)</span>;
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<span style=color:#66d9ef>UNTIL</span> NEXT = <span style=color:#ae81ff>0</span>;
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<span style=color:#66d9ef>END</span>;
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<span style=color:#75715e>//Notify(Observer : Record "Change Observer";ChangeNotification : Record "Change Notification")**
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</span><span style=color:#75715e></span> <span style=color:#66d9ef>WITH</span> ChangeNotification <span style=color:#66d9ef>DO</span> <span style=color:#66d9ef>BEGIN</span>
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"Server ID" <span style=color:#f92672>:=</span> Observer<span style=color:#f92672>.</span>"Server ID";
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"Session ID" <span style=color:#f92672>:=</span> Observer<span style=color:#f92672>.</span>"Session ID";
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"Entry No." <span style=color:#f92672>:=</span> <span style=color:#ae81ff>0</span>;
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INSERT;
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<span style=color:#66d9ef>END</span>;
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<span style=color:#75715e>//Poll(TableID : Integer;VAR TempChangeNotification : TEMPORARY Record "Change Notification")**
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</span><span style=color:#75715e></span> <span style=color:#66d9ef>WITH</span> ChangeNotification <span style=color:#66d9ef>DO</span> <span style=color:#66d9ef>BEGIN</span>
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TempChangeNotification<span style=color:#f92672>.</span>RESET;
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TempChangeNotification<span style=color:#f92672>.</span>DELETEALL;
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RESET;
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SETRANGE<span style=color:#f92672>(</span>"Table ID",TableID<span style=color:#f92672>)</span>;
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SETRANGE<span style=color:#f92672>(</span>"Server ID",SERVICEINSTANCEID<span style=color:#f92672>)</span>;
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SETRANGE<span style=color:#f92672>(</span>"Session ID",SESSIONID<span style=color:#f92672>)</span>;
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<span style=color:#66d9ef>IF</span> FINDSET <span style=color:#66d9ef>THEN</span> <span style=color:#66d9ef>REPEAT</span>
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TempChangeNotification <span style=color:#f92672>:=</span> ChangeNotification;
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TempChangeNotification<span style=color:#f92672>.</span>INSERT;
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MARK<span style=color:#f92672>(</span>TRUE<span style=color:#f92672>)</span>;
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<span style=color:#66d9ef>UNTIL</span> NEXT = <span style=color:#ae81ff>0</span>;
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MARKEDONLY<span style=color:#f92672>(</span>TRUE<span style=color:#f92672>)</span>;
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DELETEALL;
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<span style=color:#66d9ef>END</span>;
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</code></pre></div><p><strong>__</strong> The final part of this example is an object that calls the functions above. In this example we will use a Page with a PingPong Timer Control to do the polling in (almost) real time. These are the functions on the page:</p>
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<div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-al data-lang=al> <span style=color:#75715e>//OnQueryClosePage(CloseAction : Action None) : Boolean**
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</span><span style=color:#75715e></span> ObserverMgt<span style=color:#f92672>.</span>StopListening<span style=color:#f92672>(</span><span style=color:#66d9ef>DATABASE</span>::"NAV Whiteboard Booking"<span style=color:#f92672>)</span>;
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<span style=color:#75715e>//Timer::AddInReady()**
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</span><span style=color:#75715e></span> <span style=color:#66d9ef>IF</span> ObserverMgt<span style=color:#f92672>.</span>Listen<span style=color:#f92672>(</span><span style=color:#66d9ef>DATABASE</span>::"NAV Whiteboard Booking"<span style=color:#f92672>) </span><span style=color:#66d9ef>THEN</span>
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CurrPage<span style=color:#f92672>.</span>Timer<span style=color:#f92672>.</span>Ping<span style=color:#f92672>(</span><span style=color:#ae81ff>1000</span><span style=color:#f92672>)</span>;
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<span style=color:#75715e>//Timer::Pong()**
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</span><span style=color:#75715e></span> CallUpdate;
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CurrPage<span style=color:#f92672>.</span>Timer<span style=color:#f92672>.</span>Ping<span style=color:#f92672>(</span><span style=color:#ae81ff>1000</span><span style=color:#f92672>)</span>;
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<span style=color:#75715e>//LOCAL CallUpdate()**
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</span><span style=color:#75715e></span> ObserverMgt<span style=color:#f92672>.</span>Poll<span style=color:#f92672>(</span><span style=color:#66d9ef>DATABASE</span>::"NAV Whiteboard Booking",TempChangeNotification<span style=color:#f92672>)</span>;
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<span style=color:#66d9ef>WITH</span> TempChangeNotification <span style=color:#66d9ef>DO</span> <span style=color:#66d9ef>BEGIN</span>
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<span style=color:#66d9ef>IF</span> FINDSET <span style=color:#66d9ef>THEN</span> <span style=color:#66d9ef>REPEAT</span>
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<span style=color:#66d9ef>IF</span> "Type of Change" = "Type of Change"::Delete <span style=color:#66d9ef>THEN</span> <span style=color:#66d9ef>BEGIN</span>
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<span style=color:#f92672>...
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</span><span style=color:#f92672> </span><span style=color:#66d9ef>END</span> <span style=color:#66d9ef>ELSE</span> <span style=color:#66d9ef>IF</span> RecRef<span style=color:#f92672>.</span>GET<span style=color:#f92672>(</span>"Record ID"<span style=color:#f92672>) </span><span style=color:#66d9ef>THEN</span> <span style=color:#66d9ef>BEGIN</span>
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<span style=color:#f92672>...
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</span><span style=color:#f92672> </span><span style=color:#66d9ef>END</span>;
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<span style=color:#66d9ef>UNTIL</span> NEXT = <span style=color:#ae81ff>0</span>;
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<span style=color:#66d9ef>END</span>;
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</code></pre></div><h2 id=consequences>Consequences</h2>
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<p>The PingPong control is only available on the Windows Client, so if you want to use another client you will need to use another solution to Poll for Messages. Therefore this pattern is not always going to be “real time”.</p>
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<h2 id=related-topics>Related Topics</h2>
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<p>This pattern was originally described in the following blog:</p>
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<p><a href=https://geeknikolai.wordpress.com/2015/10/30/pubsub-pattern-in-dynamics-nav-2016/>https://geeknikolai.wordpress.com/2015/10/30/pubsub-pattern-in-dynamics-nav-2016/</a></p>
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<p>Below is the Wikipedia link to the PubSub pattern</p>
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<p><a href=https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern>https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern</a></p>
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