Cheque printing direct from the iSeries.

Dear all,
 
For one of our customers we are to print cheques direct on a cheque printer.
This Cheque printing requires a bit more than normal printing because we want 
to be damn sure that the cheque is printed and is printed only once and ....?!
 
I have to assume that we are not the first ones to do so and that perhaps this 
is a very common thing to do.
What we would like to know is:
- Are tools available to do this?
- What kind of printers are suitable?
- Are there routines available to use with specific printers?
- Anything to think about we might overlook?
- Any experience that could help us!!
 
Any help/response appreciated.
Kind regards,
Eduard Sluis.