Customizing the booting of operating system

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Hello

I have a task at hand. I am making writing an application to send messages via GSM from my computer to mobile.
When I turn on the computer, before booting the Operating System, a message is sent to my mobile that access to my computer is requested. Based on the reply I give(Yes/No), the user must be able to boot or not boot into the Operating System.
I want to know how to make my application run before the operating system is booted. Any articles or examples would be helpful. The Operating system may be Linux/Windows

Thank You in advance

Posted 14-Feb-13 17:40pm

Abhishek Durvasula

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dan!sh 14-Feb-13 23:46pm

How will you send message to phone? Via internet? I am not sure if that can be done.

Sergey Alexandrovich Kryukov 15-Feb-13 0:06am

Not that important... the problem is more fundamental. Please see my answer.
—SA

Abhishek Durvasula 14-Feb-13 23:55pm

actually that part is done through a GSM module.

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Sergey Alexandrovich Kryukov · Answer 1 · 2013-02-14T18:05:00

I see the contradiction in the question.

Suppose you have solved this problem. Eventually, some code sends you a GSM message. What is the platform running this code? Whatever you do, the environment which allows your code to send a message has a messaging subsystem, networking, and after all, a system loaded operational. What is that if not an OS?

If you follow my logic, you will see that to send a message, you already have OS loaded. I suggest you to think on a different idea. You can let your OS to load; according to my arguments, this is unavoidable. But you may block the logging on until your confirmation. And this is pretty simple.

How about that?

—SA