I bought a new LexMark Printer (Optra T612) with the Duplexer option.
the duplexer unit installed, it gives two-sided printing all
the time. Is there any way to disable it without deinstalling
the duplexer unit? For example, there is a check box in the
Windows 98 driver. So we can set up two printers with that option
box checked differently. What can we do within LInux?