Stop access database being opened a second time - microsoft.public.access

Message from discussion Stop access database being opened a second time

From: "Diarmuid" <diarm...@deadspam.com>
Subject: Stop access database being opened a second time
Date: Fri, 10 Dec 2004 17:11:51 -0000
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Hi
    If a user already has my frontend opened on their pc, I want a message 
to appear when they open it a second time. How can I check for this?
Thanks
Diarmuid