The Window Closer X

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When you catch the _EXIT, you can check how they were trying to close it and then use SYSTEM to close. Looking at the Wiki page on _EXIT, the function returns what method the user was using to attempt to close the program. If they pressed the X, you can just ignore it. If you wanted it to close on CTRL + BREAK, like in the example, you could then use SYSTEM when the return value matches.