[Phpprintipp] Keep various documents on the same printer within a printer pool

[Markus Klein]

Hi everyone,

I've set up a printing environment with two printers being load balanced 
behind one printer pool URI for a webshop.

Within one webshop order, we use the PHP::PRINT::IPP class to create 
several documents and address labels, each from different trays, which 
works fine with each having its own print job, as long as there's only 
*one* printer.

Now the challenge is: How do I make sure in a load balanced multi 
printer environment shared under the same URI, that all the documents 
from the various trays, that belong together for a webshop order, come 
out of the SAME physical printer?

Thanks so much for your help.
Markus