The goalkeeper position is taken by any player who can run out of and leave their goal to actively participate in outfield play.
Once the danger has passed, that player (the "rush goalie") returns to normal outfield play.
However, when the other team is on the attack, the closest player to the net or the Last Man Back is allowed to handle the ball, taking on the role of goalkeeper.
Another variation, common on schoolgrounds in Canada, includes the ability of multiple players to play the role of goalkeeper, simultaneously.
Any player may make a play with their hands as if they were the goalkeeper, as long as they are in the goal area, or "crease".