[reSIProcate] questions on TU and stateful proxy

[Micky Kaufmann]

Can anyone provide me small descriptions for the 'TU' resiprocate
classes.
(TuShim, TuIM)
Does TuIM stand for 'transaction user instant messeges'?
Does one of the classes at reciprocate represent a stateless proxy?

Can anyone can also provide a short help on the classes:
CpimContents, Executive, Pidf, Pkcs7Contents?

Thanks,
Micky