If you are logged in as the Admin, you can close QuickBooks for another user.

To log a user off from a QuickBooks company file...

1. Launch QuickBooks Messenger (Company menu > Chat with a Coworker).
2. From the Actions drop-down, select Close Company File for Users.
3. Select the user whose QuickBooks you want to close.
4. Select Close Company File.
5. In the Confirmation window, select Yes.