INT 2F U - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE
        AX = 1125h
        STACK: WORD subfunction
                5D07h get print stream state
                        Return: DL = current state
                5D08h set print stream state
                        DL = new state
                5D09h finish print job
Return: CF set on error
            AX = error code (see INT 21/AH=59h)
        STACK unchanged
Note:   called by DOS 3.1+ kernel
SeeAlso: INT 21/AX=5D08h,INT 21/AX=5D09h