What commands involve this concept?
What functions and variables involve this concept?
What command does this keystroke sequence run?
What are all the key bindings for this buffer?
What command does this keystroke sequence run, and what does it do?
What are the last 100 characters I typed?
Display the *Messages* buffer.
What is the key binding for this command?
What does this function do?
What does this variable mean, and what is its value?
Tell me about the mode the current buffer is in.
What is the syntax table for this buffer?