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Q: 

timer application for cyber cafe.How to lock window after 1 hr session?

I am creating one application for a cyber cafe.I just have to create one exe file that I'll run on each system of cafe.Requirement is a small timer window, a customer can only be able to surf internet when he/she clicks start timer button.one timer session is set for 1 hr.when 1 hr is over it will lock the window and again customer will be prompt by popup like continue Yes or No?
I have no idea how I can lock the window or stop internet

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