The Bar
Essentially the multiplayer lobby, this is where the bulk of the game takes place. All the usual services are available such as the shop and blacksmith. On the left is the market window, communications book and options book. On the right is the mission board, your stash, and a man who handles monster cores. The blond is just decoration.
If you are behind a router or firewall, port 2400 UDP must be open for people to join your game.