printing output from prog

I am using borland c++4.5 compiler.
Can anyone tell me how to set up the compiler to use my printer from within my code. Am I right in thinking it is somewhere within the options environment settings?
Thanks.

Sorry about the previous question.
I have code in my program that should access my printer:-
fprintf(prn_ptr,"Hello"); for example.
The printer has been opened by prn_ptr=fopen("LPT1","wt");
and I have tried prn_ptr = fopen("PRN","wt"); but I cannot open the printer (fopen is returning an error).
My printer is connected via USB, I am using Win98SE. What should I be setting up within Borland to make this work?

Try changing "LPT1" to the name of the default printer in Windows.

Been a long time since I used DOS.