Hello.
Let's say I have a WCF service running.
How do I make a Windows Forms application (in C#) to talk to that WCF service, to call its functions?

This would take a while to answer thoroughly. However, everything WCF is fully documented on MSDN here. There's a getting started tutorial, samples and all. Plus. there's the WCF section of their dev center, lots of blogs covering that stuff, relevant MS forums and newsgroups to ask questions, plenty of videos on channel9, likely lots of sample code and tutorials on places like codeproject, codeplex, etc. Just gotta look around a bit -- there's no shortage of resources. There's also plenty of good books wrote on the subject.

I've found what I wanted.
Thank you