Is there a generic way to lookup what a hotkey/shortcut does under current user prefs? Example: today I worked through a tutorial where the person running the tutorial casually said "And now we'll double tap R..."

This is easy enough to follow, behaved as expected, and I can see that the behavior is different from just hitting R once and rotating normally. I am not sure what the nature of this difference is, though, and would like to be able to look up in my Blender interface: what action/behavior is currently mapped to the key combination "double-tap R"?

Is there a generic way of doing so?
Yes, there is.

You can go to Setting &gt; Keymap, here is all the input event user does.

And up there is a search bar. With Key-Binding search method selected, you can search your short cut by key.



If you are using 2.79b for an old favor. The same panel is in user preference &gt; Input.

And the sequence of what you tap when operator is running (the second R) is inside the modal group keymap, you need to expand the action group to see it.