An OS X utility to allow the use of modifier keys across multiple external keyboards
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Dual Wielding

Warning and a suggestion

This utility has a few bugs that can randomly cause it stop working under quite a few situations. Someone else has put together a new version of the tool based on the same original source. Although I haven't had a chance to try this other utlity, I recommend you do so! It's bound to be better and less buggy:


DualKeyboard is a small utility to allow the use of modifier keys "across" external keyboards in OS X. This is useful for people who want to use multiple external keyboards in a split-keyboard arrangement, or because they use a foot pedal or other assistive device.

DualKeyboard is not mine. It was written by Chance Miller of I have preserved it on GitHub in case his site disappears from the Internet.

To use, simply compile using Makefile and then run ./alterkeys. You may need to check "Enable access for assistive devices" in the Universal Access preference pane if you haven't done so already.