Technical fouls include holding, interference, pushing, illegal offensive screening (usually referred to as a "moving pick"), "warding off", stalling, and off-sides. A screen, as employed in basketball strategy, is a blocking move by an offensive player, by standing beside or behind a defender, to free a teammate to shoot, or receive a pass; as in basketball players must remain stationary when screening. Warding off occurs when an offensive player uses his free hand to control the stick of an opposing player.