[Stackoverflow] [Progress OpenEdge ABL] What's the meaning of "WHEN ? THEN"?

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Dominique

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While reading some source code, I just stumbled upon the following piece of code in Progress:

Code: 
WHEN ? THEN
...

In other languages, I've seen code like IF TRUE THEN ... (this code is always to be run) or IF FALSE THEN ... (this code is never to be run).

As ? means "nothing" in Progress, does this piece of code mean the same as IF FALSE THEN ...?

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