printing problem

Respected sir/madam

I have 25 PIII computers with 2000 operating system & 2070 epson,245 TVE printers. I have problem in printing Dos base application print on network printer (on local printer it is coming).
Windows prints are coming from all computers on network printers but not from Dos (I also take that printer as a default printer). Please give me a solution.

Thanking you
kaustubh