You have to be a super user in order to be able to check which staff are logged in to Expert Agent.
Super users will get a 'Current Users' option in their Tools menu:
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Clicking on this will show you the branch, names of staff who have logged in and the time at which they logged in:
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If appropriate, there is a button to end a user's session. They would lose any unsaved changes, so it is best to check they definitely aren't using Expert Agent before doing this.