python server

[linuxpld]

Hello

I`m writing a program (server in future) in python.
I would like to write it in such a way that I will be able to write gui
in any language and connect to my python program and use functionality
included with it.
are there any libraries that I could use?

I dont know if i wrote it understandably but maybe picture will explain
it:

|------------|
| python |
|            | <- module in python -> <- connection ("???") -> <-gui in
any language (java, c++, python, etc).
| server  |
|-----------|
what could I use as "???"? http? mqseries? webservices? what are the
possibilites?

thx for answers
linuxfan