Shoutbox

That info is stored in the registry in the binary key:
HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger\MachineName

So, it is relative easy to make a basic script which adds this to the user's name.
Only difficult thing is that you need to poll this registry location in case it changes.
Also, you need to take in account that the user can change his/hers name (OnEvent_MyNameChange).