Take a look at the contents of your /boot/home/config/add-ons/Tracker directory and you’ll notice that all of the files stored there end with -X. For example, mine currently looks like:

ExpandMe.x86-X
Reveal Original-R
SetPerms-S
TermHire-T
Tracker Grep x86-G
ZipMe.x86-Z

These extra letters represent the keyboard shortcut you can use to access each Add- On. On the right side of your keyboard, hit Alt+Ctrl+letter. For example, Alt+Ctrl+T will invoke the TermHire Add-On and open a Terminal in the current directory. You can change these keymapping just by changing your Add-Ons‘ file names.