dynamically add other users to a conversation (not a MUC chat-room)

Using MicroSoft Messenger, I have found that a particularly powerful method of collaboration is to dynamically add users to a conversation.

is this possible using ejabberd, and some Jabber client?

note that I'm NOT talking about setting up a static/persistant MUC chat-room, which seems to be working fine for me.

an example of the collaboration I'm talking about is:

- in my Systems support role, I'm messaging with a person in a client dept.
- we discover an additional resource will facilitate solution of our problem, and we add them.
- we add additional people to the conversation which persists untill the problem is solved, then we all "leave"
the conversation.

this is so easy, and so powerful under MicroSoft Messenger -- can I do it with jabber?

thanks,

-Kevin