This site helped me do what I think you're trying to do.
I have my main desktop computer hooked up to my wireless router (have 2 laptops, and a third desktop on wireless), and wanted to share my printer among them all. A bit overkill, sure, but now I have full file sharing and everything. It worked like a charm.
This walkthrough sets up your linux box as a primary domain controller (WinNT-style), so that you can log on to it, access files on it, print, whatever. Not sure if you want all this functionality; I didn't, but I often find it quite handy.
If nothing else, it should get you familiar enough with SWAT that you would be able to figure out how to fine-tune what you want.