Some actions in Spelunky can be performed by pressing a single key, instead of pressing many. For example, to throw a bomb, usually the player must first switch to it with the C key, then press X once to light it, and again to throw it. Pressing the A key does all of these.

Key List

A Throw a bomb in the direction you are facing or holding on the keyboard (i.e, pressing up will throw the bomb at a higher trajectory, just like normal.)
S Throw a rope (in the same way as you normally use a rope, so holding down near an edge and pressing S will unfurl the rope so you can climb down).
F4 Toggle between fullscreen and window mode.
F10 Quit the game.
Esc then F1 Kill yourself.
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