How to Set up Khmer Unicode NiDA Keyboard for Mac:

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  • Go to System Preferences > International (or Language & Text for Snow Leopard) pane
  • Select “Input Sources” tab and desired Khmer Keyboard
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  • CLOSE System Preferences. You may need to reboot the computer for Keyboard to take effect.
  • In both keyboards, if the CAPS lock is depressed, the output will be as a standard English keyboard.

Copy from: http://www.cambosastra.org/khmer-unicode-nida-keyboard-for-mac/