Would it be possible to communicate with an Acknex server via HTML5 Websockets? Maybe using the Anet plugin?
I have to admit I have no experience whatsoever in GStudio multiplayer coding, so I'd be glad to hear about any advice and information from you guys.

Anet plugin won't speak websockets. But i am pretty sure it can be done with a plugin.

There are several C/C++ websockets libraries existing, but I have no idea how to integrate them into Acknex. I guess I'd need to create something called a "wrapper" since I can't just use the DLLs, right?

Is there a tutorial available on how to achieve what I want to do or at least something that puts me in the right direction?

check out the sdk_plugin folder in yout Gstudio folder

You can alternatively use LoadLibrary() and GetProcAddress() to load the library at runtime and get addresses out of it. Just include the right header and bind the correction functions and you are done.

From what I gathered from the manual (thanks Sid for pointing me in the right direction!) I can use the Windows API directly from within Lite-C, right?
Does this mean I could use these protocols:
http://msdn.microsoft.com/en-us/library/windows/desktop/hh437448(v=vs.85).aspx
just by including the right functions?

edit: disregard that, it seems this component is only available in Windows 8

you could implement the websocket protocol with tcp communication and sockets.
a web socket is afaik just a socket connection that builds its connection via a http header.

It really is a tiny bit more complicated than that.

Also, various incompatible versions of the protocol.

only a little
maybe there's another c library for that

http://libwebsockets.org/trac/libwebsockets

Pure C Websocket library, this seems to do the trick... now I only need to find the time to work myself into it