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On 27/01/2010, at 6:18 AM, Scott Lindstrom wrote:

That's interesting; if I was the developer of the command I would most
likely include the checking in the command source itself (why have both VCP
source and command source?).


Because the VCP is run during SEU entry of a CL program as part of prompting (*) the command whereas the CPP is not run until the CL program is run. Some parameter validation cannot be performed using the facilities of the command definition language yet still needs to be validated before a command is actually run.

(*) Can't recall if the VCP is run when Enter is pressed after command completion.

Regards,
Simon Coulter.
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