[pdftex] defining paper feeds for printer

[Stefan Foulis [spiderware GmbH]]

hello

I'm designing a web based system that renders invoices with LaTeX  
(and KOMA). I'm now encountering the problem, that I need to use  
different paper for some of the pages when printing... normal paper  
for most pages, but a special paper with a pre-printed part for the  
"pay-in slip".

Is there any way to define this in a pdf, so that it's possible to  
use paper from different feeds on a per page basis?

thanks
stefan