configure sharing printing via wifi

No response in MS help and support forum:

both computers in this exercise have XP Home, SP2,

mine is computer A
hers is computer B
printer is X, USB connected to A
computer c- wireless router.

computers A and B share a wireless Internet connection where Internet comes
from a
main wireless router connected to computer C.

I wish to share printer that is hard connected to computer A with computer B
using wireless or Internet system if possible. Computer C may or may not
wish to use printer X, ever. Irrelevant to this I hope.

Made printer X, which is connected to computer A available for sharing.
Via printer/ fax in control panel.

Can't seem to get computer B connected to printer x in computer A and
something may be missing.

do I first need to do something with computer C to set up printer X so
computers A and
B can share it?

if this is at all possible, the more details in the instructions, the
better. No Kidding the more details the better.

Please.

Cordially,
Robert