Out of Bounds
A ball that has gone completely over the boundary line is considered out of bounds. If any portion of the ball is on or over the boundary line, the ball is still in play, as it is in soccer. A player can be over the boundary line and in possession of the ball without the ball being considered "out of bounds" if part of the ball is still in play.
Possesion and disposal of the ball
A player may hold the ball for unlimited time when he is not being held by an opponent. However, the umpre has the discretionary power to tell the player to "get on with it" if he feels the player is taking too much time and is delaying play.
A player lying on or over the ball is considered to be in possession.
A player running with the ball must bounce the ball or touch it to the ground once every 15 meters. (The distance is usually not strictly enforced, especially if the runner is challenged.)
A player in possession of the ball and held by an opponent must dispose of the ball immediately by kicking or handballing the ball. (Tackling is permitted, but only between shoulders and knees.)
To handball correctly, a player must hold the ball in one hand and hit it with the clenched fist of the other hand. The hand holding must not move relative to the player's body. (Correct technique is sometimes more honored in the breach than in the observance.) Overhand passing is not permitted.
A mark is allowed when the ball is caught from a kick which has traveled a minimum distance of 15 meters, and the ball has traveled in the air without being touched by another player. (The ball usually doesn't have to be held for very long, especially in a physical marking contest; and yes, anything goes as long as both contestants "have eyes for the ball".) The player taking the mark may play on immediately, or go back and kick over the position where he took the mark. If he opts to play on, he is fair game to be tackled. If he opts to stay put and take a kick, no oppostion player can touch him.
Shepherding
A player may retard the movement of an opposition player towards that of the ball, however it may only be done within 5 meters of the ball. Shepherding allows the opposition player to be pushed in the chest or side, or for the player to place his body between the opposition and the ball (when the player himself is not in possession of the ball.) Comparable to screens in basketball or blocking in American Football.