INT 16 - PC Tools 7 CPSCHED/DESKTOP - INSTALLATION CHECK
AX = FEEFh
CX = 0000h
Return: CX = ABCDh if PC Tools scheduler (CPSCHED or DESKTOP) installed
BX = segment of resident portion

See also: 16FFEF

16FEEFCX0000 - PC Tools 7 CPSCHED/DESKTOP - INSTALLATION CHECK