Int 2F Fn D201  U - Quarterdeck Rpci - Manifest V1.0+ - Installation Chec  [G]

   AX = D201h
   BX = 4D41h ("MA")
   CX = 4E49h ("NI")
   DX = 4645h ("FE")

Return: BX = 5354h ("ST") if installed
Range: AH=C0h to AH=FFh, selected by scanning AH=D2h-FFh, then AH=C0h-D1h

See Also: AX=D200h