INT 2F U - WANG_ER.COM - INSTALLATION CHECK
        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
Note:   AH=C0h is the default; WANG_ER scans all multiplex numbers from C0h to
          FFh for a free spot on installation.  The installation check is
          completed by comparing the resident code with the copy in the
          transient program

.