On the very top right corner of the screen appears the minimap. The minimap shows you the location of your party on the map. The party leader is represented by a special icon, your other characters are represented by blue dots, NPCs are represented by green dots, and enemies are represented by red dots.
Around the minimap, there are also the Journal, Game Menu, and Show Map buttons. Two buttons on the bottom-right that let you zoom in and zoom out of the minimap.
The diamond shaped button, Connection Menu, brings up a menu that allows you to determine who can and cannot join your game in multiplayer