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Tech Tip: Declaring $0 for a Trigger
PRODUCT: 4D | VERSION: | PLATFORM:
Published On: July 23, 1999
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The $0 parameter (Longint), which is the result of a trigger, is typed by 4D Compiler if the parameter has not been explicitly declared. If you want to declare it, you must do so in the trigger itself.

This parameter declaration cannot be written in a COMPILER method.