Int 2F Fn C000  U - Tsengp.com - Installation Check                        [V]

   AX = C000h

Return: AL = status
       00h not installed, OK to install
       FFh installed
       DS = segment of resident code
Program: TSENGP.COM is a TSR supplied by Compaq to fix an incompatibility
     between some applications and Tseng ET4000-based video adapters
Range: AH=C0h to AH=FFh, selected automatically

Note:  the installation check is completed by comparing the first eleven
     bytes at DS:005Fh against the TSR's code (80h FCh 06h 74h 0Ah
     80h FCh 07h 74h 05h EAh)