It allows you to configure shortkeys, which - when pressed - start applications. XFCE offers this too (start->Settings->Keyboard->Application Shortcuts), but because i am used to xbindkeys, because you can use it also if you choose to switch to a different X-desktop-environment and because i had some strange problems with the configuration of shortkeys in xfce, i prefer to use xbindkeys.
The tarball includes the source-code for completeness. But you just need to copy the .xbindkeys-binary (only 108846 bytes) to some location you prefer (i created ~/bin/ for that and added it to my PATH) and assign it to the programs that are automatically started on session-launch. After that you have to create/edit a file in your home-directory named ".xbindkeysrc". Here is the example-config.
Spoiler!
This might be a little confusing but in the end it's easy. For example i defined 4 shortkeys so far:
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If you want to find out a name of a key, then i can recommend to use "xev". It's in the repository and only 16800 bytes large. Just run it from a terminal-window and all keypresses/-releases you execute after that are shown.
EDIT: The also included command "xbindkeys_show" won't work as it depends on the command "wish". I didn't fix this, because i see no real (or important) use for "xbindkeys_show".