Adding a Win 98 Com to nt 4.0 ser domain

How do you add a 98 comp to a nt 4.0 domain?
Nt 4.0 doesn’t recognize the 98,account for 98 is listed in user manager,98 boots & doesn’t recognize any network.Message (no domain server available to recognize password).Neither 4.0 or 98 is listed inthe others network neighborhood.