ys keycode 96 = F12 So, in RedHat GNU/Linux 5.2 on a PC, Num_Lock generates keycode 77. The following steps are taken: 1. clear the assignment of Num_Lock to mod2; 2. swap the keycodes assigned to F12 and Num_Lock; 3. assign Num_Lock back to mod2. The .xmodmaprc file looks like this: ! File: .xmodmaprc !