have you tried 'report myform to printer prompt'? this will give
you all of the options available to your current printer -- from here
you should be able to select the tray. If you want to automate
this for your user, i'm not sure -- you might be able to do that
from the report layout area.....

>How do you print to lower tray on HP Laser 4SI
>
>TIA,
>
>Lee