OSVER()
 Returns the DOS version number
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 Syntax

     OSVER() --> cDosVersion

 Returns

     OSVER() returns a character string that contains the version number of
     the operating system in use.

 Description

     OSVER() returns the version number of the operating system in use.  The
     format picture clause is always "'9.99".  Use OSVER() to determine the
     DOS version your application uses.

 Example

     Certain operations require particular DOS versions:

     IF OSVER() < "3.30"
        ? "COMMIT can not be used!"
     ENDIF