http://www.macupdate.com/download/45360/keycodes
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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.
What's New
Version 2.0.1:
- Bug Fixes and Improvements: Prepared for upcoming Gatekeeper changes
Requirements
OS X 10.7 or later
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