INT 16 - PC Tools v5.1+ DESKTOP API - INSTALLATION CHECK
AX = FFEFh
CX = 0000h
Return: CX = ABCDh if PC Tools DESKTOP.EXE installed
BX = segment of resident portion
AX = ??? (v5.1/5.5 only)
SeeAlso: AX=FFC5h,AX=FFF3h

See also: 16FEEF

16FFEFCX0000 - PC Tools v5.1+ DESKTOP API - INSTALLATION CHECK