NUMDISKF()
 Determines the number of installed disk drives
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 Syntax

     NUMDISKF() --> nTotalFloppy

 Returns

     NUMDISKF() returns a value that specifies how many disk drives are
     installed in the system.

 Description

     NUMDISKF() determines the number of disk drives and allows you to choose
     which drive you want to copy onto.

 Example

     Determine if a B: drive exists:

     IF NUMDISKF() == 2
        IF DISKREADY("B")
           ? "You can also use Drive B:!"
        ENDIF
     ENDIF