Sending a printed output to a definite output queue

It seems, that an answer to my question should be very easy.....
The problem is :
I know how to create a printed output (a spool file in an output 
queue) from my C program.
I just create a PRTF (for simplicity - without DDS, simply with a 
line length). Then in my program I open it with fopen for write and 
then do fwrite into this file.
The printed output appears in a user's default output queue.
What I need is a possibility to send it to a particular output queue 
without making it default.

Thanks in advance

Eugene Astanovsky

Jevgeni Astanovski, 
IT Hooldusosakonna juhataja                                
Optiva Pank.
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