two domains one samba server
 

I have two domains, abc.com and xyz.com, is it possible to use a single samba machine to act as the PDC for the two domains? how am i going to go about this?

Welcome to LQ.

I have never tried this but I think you could do it with a machine that has 2 ip addresses. You will need to configuration files and start 2 servers, one for each domain on different ip addresses.