Int 2F Fn E000  - Stuffit V3.21+ - Installation Check                      [K]

   AX = E000h
   DX = 5354h ("ST")

Return: AL = FFh if installed
       BX = version (BH = major, BL = BCD minor)
       DX = segment of resident code
Program: StuffIt is a freeware delayed keyboard stuffer by Terje Mathisen