wouldn't it be nice to just know its name?

[Arvuti]

By default pressing W moves the character forward.
By default pressing S moves the character backwards.
By default pressing A moves the character sideways left.
By default pressing D moves the character sideways right.
And the last fact, this is a bit unique to the game, by default pressing space makes the character jump!

no no no jens, you forgot frictional games most revolutionary feature yet. Moving the mouse makes you look around.