Yes you can. I am still working on my online RPG
http://forum.thegamecreators.com/?m=forum_view&t=207369&b=48
It isn't up right now since I am having some hosting issues.
The client is AppGameKit V1, Tier 1 and the server end is C# with no AGK. The AppGameKit net code isn't really for a client/server game, just more of a peer to peer game. But I was able to hack it and get something going. Not sure how reliable it is since if the server sends packets too fast to the client, it breaks the connection, hehee, probably bad C# code on my part though.
I couldn't do a AppGameKit server because it requires openGL and a lot of the VPS servers online for lease, don't support openGL since they don't have a real video card in the virtual system. Or something like that.
anywho