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<meta name=generator content="Hugo 0.89.4">
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<title>Cross Session Events :: AL Guidelines</title>
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<div class=highlightable>
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<ul class=topics>
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@ -57,7 +57,7 @@ ALGuidelines.Dev
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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 Facade" class=dd-item><a href=/navpatterns/1-patterns/data-migration-facade/>Data Migration Facade</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/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-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></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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@ -107,8 +112,22 @@ ALGuidelines.Dev
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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></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ title="Internally-used DotNet Types" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/>Internally-used DotNet Types</a></li>
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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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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/class-coupling/ title="Class Coupling" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/class-coupling/>Class Coupling</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/ title="Cyclomatic Complexity" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/cyclomatic-complexity/>Cyclomatic Complexity</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/ title="Encapsulate Local Functionality" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/encapsulate-local-functionality/>Encapsulate Local Functionality</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/ title="FINDSET FINDFIRST FINDLAST" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/findset-findfirst-findlast/>FINDSET FINDFIRST FINDLAST</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/initialized-variables/ title="Initialized Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/initialized-variables/>Initialized Variables</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/maintainability-index/ title="Maintainability Index" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/maintainability-index/>Maintainability Index</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/parameter-placeholders/ title="Parameter Placeholders" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/parameter-placeholders/>Parameter Placeholders</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/static-object-invocation/ title="Static Object Invocation" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/static-object-invocation/>Static Object Invocation</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/unreachable-code/ title="Unreachable Code" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/unreachable-code/>Unreachable Code</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/unused-initialized-variables/ title="Unused Initialized Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/unused-initialized-variables/>Unused Initialized Variables</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/unused-variables/ title="Unused Variables" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/unused-variables/>Unused Variables</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/ title="Variable Capacity Mismatch" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/variable-capacity-mismatch/>Variable Capacity Mismatch</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/ title="WITH Scope Name Collision" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/design/with-scope-name-collision/>WITH Scope Name Collision</a></li></ul></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/ title="Internally used DotNet Types" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internally-used-dot-net-types/>Internally used DotNet Types</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internationalization/ title=Internationalization class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internationalization/>Internationalization</a><ul>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/ title="Using Calcdate" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/internationalization/using-calcdate/>Using Calcdate</a></li></ul></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/localizability/ title=Localizability class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/localizability/>Localizability</a><ul>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/ title="Begin as an 'After Word'" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-as-an-afterword/>Begin as an 'After Word'</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/begin-end/ title="Begin-End - Compound Only" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/begin-end/>Begin-End - Compound Only</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/ title="Binary Operator to Start Line" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/binary-operator-line-start/>Binary Operator to Start Line</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ title="Blank Lines.md" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/>Blank Lines.md</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/ title="Blank Lines" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/blank-lines/>Blank Lines</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/case-actions/ title="CASE Action" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/case-actions/>CASE Action</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/ title="Colon usage in CASE" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/colon-usage-in-case/>Colon usage in CASE</a></li>
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<li data-nav-id=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/ title="Comments inside Curly Brackets" class=dd-item><a href=/navpatterns/3-cal-coding-guidelines/readability/comments-curly-brackets/>Comments inside Curly Brackets</a></li>
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@ -258,7 +277,7 @@ ALGuidelines.Dev
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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>_<strong>Note:</strong> _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><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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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>**__**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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</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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@ -354,12 +373,12 @@ ALGuidelines.Dev
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<div style=left:-1000px;overflow:scroll;position:absolute;top:-1000px;border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px>
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<div style=border:none;box-sizing:content-box;height:200px;margin:0;padding:0;width:200px></div>
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</div>
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<script src=/js/clipboard.min.js?1638662727></script>
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<script src=/js/perfect-scrollbar.min.js?1638662727></script>
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<script src=/js/perfect-scrollbar.jquery.min.js?1638662727></script>
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<script src=/js/jquery.svg.pan.zoom.js?1638662727></script>
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<script src=/js/featherlight.min.js?1638662727></script>
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<script src=/js/modernizr.custom-3.6.0.js?1638662727></script>
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<script src=/js/relearn.js?1638662727></script>
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<script src=/js/clipboard.min.js?1638739417></script>
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<script src=/js/perfect-scrollbar.min.js?1638739417></script>
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<script src=/js/perfect-scrollbar.jquery.min.js?1638739417></script>
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<script src=/js/jquery.svg.pan.zoom.js?1638739417></script>
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<script src=/js/featherlight.min.js?1638739417></script>
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<script src=/js/modernizr.custom-3.6.0.js?1638739417></script>
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<script src=/js/relearn.js?1638739417></script>
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