Click above to get retro games delivered to your door ever month!

INT 16 - Microsoft Word internal - MICROSOFT WORD COOPERATION WITH TSR
        AX = 5500h
Return: AX = 4D53h if keyboard TSR present
Notes:  during startup, Microsoft Word tries to communicate with any TSRs
          that are present through this call.
        If the return is not 4D53h, Word installs its own INT 9h and INT 16h
          handlers, otherwise it assumes that the TSR will handle the keyboard.