Gate monkey

From Guild Wars Wiki

A Gate monkey, often abbreviated GM, is a player who will join another player's party to open a gate for them in return for payment. No other services are rendered unless the players agree to something else. A good example is to open the gate north of Ascalon City in order to access The Northlands. Being a Gate Monkey is a fairly easy way to make money at lower levels.

Gates are normally used by certain quests to require players to have a companion in their party while on them. By employing a Gate monkey, this requirement can be bypassed. Once the gate is open, the monkey then leaves the party, allowing the hiring player to start the quest or hunt alone.