Hi Sebastian,
I've not interacted with WCF specifically, but from my reading it seems that WCF can connect over TCP/IP, and uses XML as well. It seems it can behave as a web service (over HTTP) (NetWebclient) or perhaps over a direct TCP connection ("NetSimple" in NetTalk terminology)
So the short answer seems to be "yes, if it supports tcp/ip" - but I would need a lot more documentation on the "thing" you are attempting to connect to in order to be more specific than that.
cheers
Bruce