How can I intercept all key events, including ctrl+alt+del and ctrl+tab?

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You can’t. The whole point of Ctrl+Alt+Del is that only the system gets to handle it, ’cause that way the system can always handle it.

Fortunately, Windows has built-in support for password-protected screensavers (available as the “On resume, password protect” option in Display Properties, or via group policy). Just use that.

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