How to access different trays of a printer

[Andreas Tille <tillea@rki.de>]

Hello,

I'm using magicfilter from potato.  The target printer is a
compaq Pagemarq 20.  This printer has three different trays
(loaded with two different kinds of A4 paper and the third with
A3.  There is no special driver contained in magicfilter
(ghostscript).  So I'm using hplj4m as postscript printer.

Now I wonder how I could use the different trays.

Kind regards

      Andreas.