Well here is an idea:
Make a status table. This table holds a numeric value 0 = okay 1 = time to log off.
Then have the client applications run a check of this table on a frequent basis. If the client sees the status 1 it prompts the users to shut the application down. Or you could make it do a custom shutdown method.
Also have this table checked on startup. If the status is 1 again then don't let users login.
When you are done just set the status back to 0 and everyone can get back in.
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