Int 2F Fn C300  U - Spacemanager - Installation Verification               [d]

   AX = C300h
   DX = 0666h for any SpaceManager prog or program identifier (see below)
   BX = 4F53h
   CX = 4F48h

Return: AL = FFh if BX/CX as specified and specified program installed
       BX = 6F73h
       CX = 6F68h

Notes: AH=C3h is the default; SpaceManager programs scan from C3h to FFh for
     a free multiplex number
   this call is chained if BX,CX, or DX are not as specified above

See Also: AX=C300h/DX=0000h

Values for SpaceManager program identifier:
 9000h SMOUNT (SuperMount)
 9001h SELECTC (SelectCompress)
 9002h SUPERX (SuperExchange)
 9003h FORTUNE (FortuneTeller)