segmentation of spooled output on the iSeries...

List,

I have another mainframe-to-iSeries question for you.

On our VSE system, every night, we print tens of thousands of 1-page letters 
on our Xerox laser. The program on the VSE system creates 1 large "report" 
to the spooler containing all of the letters in a certain order. The program 
"segments" the output on a logical boundary, usually a combination of number 
of letters and form code/type. The reason this is done is so that printing 
of letters can be started (i.e. sent to the Xerox) BEFORE the program has 
completed processing of all the letters for the run. This saves time, 
allowing the operator to get a "jump" on the printing by not having to wait 
until the program has finished to be able to release the print.

My questions:

Is there a way to duplicate this process on the iSeries?

Can a COBOL program interface with the system so that it can "segment" the 
print file output?

Would it be as simple as closing and re-opening the print output file? What 
is the best way to handle this?

As always, TIA!