INT 15 - DESQview v2.00+ - "DBGPOKE" - DISPLAY CHARACTER ON STATUS LINE
        AX = DE0Ah
        BL = character
Return: character displayed, next call will display in next position (which
        wraps back to the start of the line if off the right edge of screen)
Notes:  displays character on bottom line of *physical* screen, regardless
          of current size of window (even entirely hidden)
        does not know about graphics display modes, just pokes the characters
          into display memory
        this API call may be made from a hardware interrupt handler