Help needed regarding Mac

Aiight, heres the case. I got an interview for an ISP on Tuesday and one of the requirements is to be able to provide support for Windows and Mac systems. I have no problem with windows at all. its just mac.. how does Cable Broadband work with mac and how is it set up?

anyone here can lend a hand? i dunno crap about Mac. some screenies would help aswell. or a very comprehensive tutorial.

I guess it would depend on what software they are using... I have a mac G3 (currently putting gentoo on it. BTW if anyone has ever done that succesfully, PM me. It is tough) I dont believe that mac comes with TCP/IP installed, or at least it didn't on mine, but I bought it used, so...