How to determine originator of message at the receiver?

[Paddy Carman]

Hi -
    Is it possible to determine (at the receiver), the client that
originated the message that was sent to a queue or a topic? Would this
require adding custom header fields? Has there been some work in this
direction that someone can point me to? Basically I'm looking for something
like a "from" field in XMPP.
Appreciate the help!
Thanks,
PC