Howdoes one invoke the Command Palette?

Wha tis the URL for the WPILib docs?  It links to the "API Docs" and the "Programming the XRP" pages among many others.

Which class contains button mappings?

Which method is where button mappings are defined? HINT: What do we call button "mappings" in WPILib programming?

In VS Code, how can I get to the definition of a variable?  I want to see where the variable is *declared*.

In order to use functionality from other places, a source code file needs to ____ other package(s).