what is a "panel shortcut"?

I’m trying to decipher the following advice by Derivative:

Another option, if this is in a container is to add panel shortcuts
“(See the slide-puzzle example in the palette, which monitors the arrow keys)”

that was in response to my question as to the best (fastest) way to monitor the keyboard in a way that I don’t have to duplicate the keyboard chop for every component which is monitoring keypresses.

I loaded the slide-puzzle, and… I’m puzzled! My keypresses work, but for the life of me I can’t figure out what’s monitoring the keyboard! I’ve been looking for 30 mins and either I’m missing something obvious, or I figure then it’s a “panel shortcut”… some mysterious functionality of which I know nothing about?

? txd

Does this help?
derivative.ca/wiki088/index. … _Shortcuts

awesome - thanks Achim!!