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uControl is a keyboard remapper and more. Meaning, those useless keys can now be reused, remapped, or reduced. Unix hackers will be pleased to remap the caps lock key to the control key. Indeed, that was the reason uControl was originally created; however, it has since evolved into a fairly sophisticated means of not only remapping modifier keys, but providing a virtual scroll wheel for trackpad users, providing real function keys for laptop users, swapping the right and left mouse button for left handed users, and even providing a one handed typing feature for those with disabilities. Note: the one handed typing feature has been removed due to possible patent infringement.
Alex Harper has completely rewritten the "Real Function Keys" feature. It works much, much better than before. Infact, it uses the same method OS 9 did. Mapping modifier keys to the fn key and vice versa has been removed. It was a feature that just never worked quite right. One can now remap modifier keys to nothing. That was requested to squelch the caps lock key by a lot of people. (This update will not work on Mac OS 10.3 Panther yet.)