PPC providers like Fabulous, DomainSponsor, Sedo, and Afternic allow 2 methods of forwarding traffic. The simplest is to just set the nameservers to theirs. The second method is to host the domain on your own server, then redirect traffic to the correct PPC page. Technically, you can have a PPC page that opens up several windows, including one or more PPC providers. However, I think that configuring your domain to open more than one PPC provider would be against their TOS and get your PPC account cancelled.