The tag is used to spawn an application from within CFML code, optionally capturing any generated output. can be used in two ways – ColdFusion can wait until the spawned application has finished processing (synchronous), or it can spawn the application and then continue processing immediately not waiting for the application to finish (asynchronous). This behavior is controlled by the TIMEOUT attribute, and specifying TIMEOUT=0 tells ColdFusion not to wait. Unless you need to generated output you should always specify TIMEOUT=0, after all, why wait unnecessarily? (Applies to: ColdFusion 4.5 (or later))

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