domains and mac os x


In my office we have a linux server running as our windows authentication server. I assume that its doing this by smb, but the guy who set it up doesnt know for sure (go figure...)

our 98 & xp clients authenticate as if they were on a windows domain. I would like to keeo 1 set of user accounst and set the office macs up to do the same. How would i do this?

I know it would be done through directory access, but smb doesnt allow for authentication via the logon window. Is there something i am missing or is this just entirely impossible as of yet?