When using mouse and keyboard, many players (right-handed people and/or players of modern games in particular) find the default location of certain keys to be less-than-optimal. Using the Setup program (or a corresponding menu in a source port), it is possible to reassign these key functions to other keys. One popular arrangement, commonly used in many other, more recent shooters, is known as WASD (since those are the keys that are assigned to primary directional movement):