I know if you click "Tools" & "Share Work book" it gives you a list of who is
currently using the work book.

Is there any way of using that information in the workbook itself?

Background:
We use Audio Conferencing alot in our offices and it is difficult to know if
everyone is there without seeing them. What I am trying to do is have a
shared workbook that everyone opens when they join the Audio Conference.

To make it user friendly, I was intending having a photo of each user with
the words "Joined" appearing underneath if they have opened the workbook (and
were on the Audio Conference. I would rather this was done automatically
than relying on users updating their own status.

To do this I will need to get the information out of the list that comes out
when you select "Tools" & "Share Wookbook".

Any ideas?

Many thanks