The process in the destination can be a simple stanalode exe but still host a WCF service within it - look at the samples and videos, you can even hose a WCF service in a console applciation if you want to
The proces son the source PC ( Point A) can also be a simple exe, need not be any kind of service, it can also be a simple Win Forms app or weven a console app
Do look into WCF in more depth I think itwill meet your needs