You can use the Connected User Browser to view which users are connected, send them messages and disconnect them when necessary.
To display the Connected User Browser,
click
on the toolbar in the Administration workbench. Alternatively,
select Connected User Browser
from the Tools menu.
The Connected User Browser lists the users connected. For each user the following information is provided:
In the Administration workbench, from the Connected User Browser,
you can view which objects are locked by which users. To do so click on
the
icon in the toolbar. This opens the Locked
Object Browser
that displays all the objects locked by a given user and enables you to
unlock one or more of those objects as required (depending on your user
rights).