Int 2F Fn DF00  - Hyperware Programs - Installation Check                  [c]

   AX = DF00h
   BX = product code (see #2777)
   CX = 0000h
   DX = 0000h

Return: AL = status
       00h not installed
       FFh multiplex number in use
       CX = 5948h ('YH') if selected product installed
       ---HyperDisk---
       BX = code segment of resident portion
       DX = HyperDisk local data version
Program: HyperDisk is a shareware disk cache by HyperWare (Roger Cross)
Range: AH=C0h to AH=FFh, selected by scanning AH=DFh, then AH=C0h-FFh

See Also: INT 13/AX=8EEDh
Index: installation check;HyperDisk|installation check;HyperStb
Index: installation check;HyperKey|installation check;HyperScreen
Index: HyperDisk;installation check|HyperStb;installation check
Index: HyperKey;installation check|HyperScreen;installation check

(Table 2777)
Values for HyperWare product code:
 4248h ('BH') HyperStb
 4448h ('DH') HyperDisk v4.20+
 4B48h ('KH') HyperKey
 5348h ('SH') HyperScreen