If you are using ZEN to push out the messenger client (using the .aot
file supplied with Messenger) you can set it up to automatically load
the current logged-in user's name by adding the following to the
shortcut's Parameters field in the app object:


The double percent signs transfer %USERNAME% as a variable instead of
replacing it with the value of the variable.

It took me a bit of trial-and-error to figure this out, so I thought it
might be of help to someone else.