Errol Farro

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FWIW, I'll concur that there is no programmatic way built into cf to determine what's already running, and that either of the two alternatives offered by agx that are just what I would also have offered. I can't think of any better solution.
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_agx_

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I have two .CFM, a1.cfm and a2.cfm, that cannot run at the same time. While a1.cfm is running and someone wants to start a2.cfm, a2.cfm should get the message that a1.cfm is already active and that a2.cfm cannot start. <br />
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Conversely, while a2.cfm is running, a1.cfm cannot be invoked. <br />
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Is there a ColdFusion command which can very if there is a .CFM already running ?
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I have two .CFM, a1.cfm and a2.cfm, that cannot run at the same time. While a1.cfm is running and someone wants to start a2.cfm, a2.cfm should get the message that a1.cfm is already active and that a2.cfm cannot start. 

Conversely, while a2.cfm is running, a1.cfm cannot be invoked. 

Is there a ColdFusion command which can very if there is a .CFM already running ?

How to determine if there is another .CFM already running

ColdFusion is a server-side rapid application development platform originally created by Allaire and now sold by Adobe, implementing the dynamic general purpose CFML programming language. The term ColdFusion is sometimes colloquially used to refer to the CFML language (Cold Fusion Markup Language), but can also include discussions of the server software implementation. ColdFusion runs using a customised version of Apache Tomcat. Earlier versions are bundled with JRun.