An electronic door lock dogging mechanism is provided with a bolt arranged to move into and out of a door to selectively engage a portion of a door frame to lock a door when extending out of the door and when recessed within the door, unlocking the door from the door frame. Upon authentication of a user to change credentials, credential information of multiple disparate credential stores is searched. Studies will confirm that parous females who display MC are able to tolerate donor cells from their male offspring immunologically. The client devices are typically connected to the home gateway device through a network and the client devices communicate with the host system through the home gateway device over the single communication tunnel. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle.