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I'm looking for a freeware software for Windows that will allow users to check if all the keys and LEDs on a keyboard are functioning correctly. It preferably should have a feature that can register and highlight a graphical image of a pressed key in a keyboard, to make it easier to troubleshoot faulty keys. This shareware program (Passmark) does that (and more), but I would prefer a freeware alternative.

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Yes — "Notepad" :) –  jtbandes Aug 12 '11 at 6:48
@jtbandes Doh! :) I will edit my question to make it clearer the I prefer one with a GUI that can make it easy to spot faulty keys. –  galacticninja Aug 15 '11 at 12:40
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