Int 2F/AX=C000h

AX = C000h

Return:
AL = FFh if installed
ES = segment of resident code

Program: WANG_ER is a TSR from Compaq which permits Compaq systems equipped with 3-mode floppy drives to read Wang document diskettes

Range:
AH=C0h to AH=FFh, selected by scanning for first free multiplex number

Note: The installation check is completed by comparing the resident code with the copy in the transient program