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I'm setting up key bindings in dwm for things like changing brightness and taking screenshots. In order to bind the appropriate key, I followed someone else's example and added 

#define XF86AudioMute 0x1008ff12

to my config.h, and referred to that key in my keybinding.

This works fine, but I have no idea where this value came from or how to find other similar values. For example, the PrtSc button on my keyboard is one that I haven't been able to find a value for.

What are these values, and how do I find them?

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The definition

#define XF86AudioMute 0x1008ff12

comes from the header file XF86keysym.h, though it's spelled differently:

#define XF86XK_AudioMute 0x1008FF12 /* Mute sound from the system */

To find the keysyms that your keyboard sends, use xev. Not all keys will send keysyms, however (in that case, you can't do much).

Further reading:

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