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VM_AVAIL()
   Returns available memory.

   Syntax
         VM_AVAIL(@nExpanded,@nExtended,@nXMS,@nDisk,cDriveLetter)

   Arguments
         nExpanded     Number of blocks in expanded memory.

         nExtended     Number of blocks in extended memory.

         nXMS          Number of blocks in XMS memory.

         nDisk         Number of blocks in disk memory.

         nDriveLetter  Letter of drive to retrieve information from.

   Returns
         None

   Description
         VM_AVAIL() returns available memory in blocks to variables that are
         passed by reference.