BIDI_Q_PORT(800Bh) queries the port configuration from the port driver. This function returns BIDI capabilities of the port and the BIDI software protocol of the attached printer. It also performs an implicit BIDI_INIT(Bh) to the port driver to put the printer in BIDI mode.

BIDI_Q_PORT(800Bh) does not go to the BIDI protocol converter because the information returned is used to determine the BIDI protocol converter to be used for the port.