Description: Returns or changes the list of locked input trays. The printer only pulls media from a locked input tray when the input tray is specifically requested by the print job. Additional information: Laserjet 2200 will pull paper from a locked tray if that tray is specifically requested or if the user presses the Go button on a paper mount override and there is no paper available in an unlocked tray. There must always be at least one unlocked tray. When no optional lower cassette is installed and one tray is locked, an attempt to lock the other tray will result in the first tray unlocking. When the optional cassette is installed and two trays are locked, an attempt to lock the third will fail with a return status of and a return value containing the collection of previously locked trays.