Returns the version number (as a string) of an application.
Application version strings are built into .fcx-compiled applications when they are entered in the FCAS Project Attributes form.
Syntax
FCAppVersion [(ApplicationName)]
ApplicationName
If this argument is supplied, this function returns the version number string of the specified application provided that it is loaded on the FirstClass server.
If the argument is not supplied, FCAppVersion returns the version string of the calling application.
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