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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 2 Jun 2014 23:09:31 -0600
Subject: Re: Lock Windows Screen GUI using python
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On Mon, Jun 2, 2014 at 10:28 PM, Jaydeep Patil <patil.jay2009@gmail.com> wrote:
> Dear all,
> Can we Lock Windows Screen GUI till program runs & unlock screen GUI when program finishes?

If you mean can you programmatically bring up the Windows lock screen,
then you can do this:

import ctypes
ctypes.windll.user32.LockWorkStation()

The only way to unlock it is for the user to log in.

If you mean something else, you'll have to be more specific.