G-key is also namely the other USE key. The G-key is the 'alternate use' key. More than one uses are added to some interactive objects. A menu will be open up by using the G-key and there is an access to more options than the default use ones. There is an good example for this. when a player uses the G-key on a mount, the player will be allowed to unsummon it and make it go back to being a figurine in his backpack. G-key is also designed to open a player's clan vault when interacting with a bank, and that is how a player trading with another.
