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  Description:
 
     This routine should only be used on DOS and OS/2.
 
     When called, the 26 least-signigicant bits in drive-info correspond
     to drives A: through Z:, with A: represented by bit 0 and Z:
     represented by bit 25. The corresponding bit is set for each drive
     that is present.
 
  Parameters on Entry:
 
     None
 
  Parameters on Exit:
 
     drive-info              All drives that are present.
                                    -♦-