Dos printing with client 32

In a dos program, no print job comes out of the printer unless I exit the dos program.
I am running a dos program under Windows XP on a Novell 5.1 network. It is a non NDPS printer set up with a queue on the Netware server. All printing from this workstation works fine exept this program.
I have the printer captured to lpt1 through client 32.
I know there is a trick to this… any help?
I remember in win95 I could change the pif file to make these work, but I can’t get it to work in XP.