Since the LaserWriter 16/600 PS printer is used as a remote printing queue on the TCP/IP network, output filtering is not supported by the remote LPD protocol. This is common in most UNIX remote LPD implementations. Usually, output filtering is supported using a local direct connected printer. So, using a direct connection, you can have output filtering printcap entry in your system.
Some options available to you is to add PostScript code to documents in order to change paper trays. This could also be accomplished using a shell script to control the printing.
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