This is a filter which parses the stream of keyboard events and detects simultaneous key-presses to reinterpret specific use of selected keys as modifiers, instead of their regular function. Also the timing is significant.

Example: use "a" key to activate numeric keypad on 'uio jkl m-." keys.

Packaged as a plugin for X server, Weston plugin, and a Windows 10+ filter kernel driver.

• Windows ... see instructions

• Linux -- either build from source, or use Debian (Sid) packages from my reprepro apt repository

  • Xorg server -- a patch is needed to enable plugins: xserver

  • Weston -- a patch is needed for libinput and weston