Key Codes 2.0.1 requires an Intel-based Mac and Mac OS X 10.7 or later. OS X 10.6 users can use Key Codes 2. If you're using a PowerPC-based Mac, and/or Mac OS X 10.5, you can use Key Codes 1.1 instead.
Key Codes is a little utility that displays the key code, unicode value, and modifier keys state for any key combination you press. If you're a developer, this might be useful to you.
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