Funcom is straightforward when it states that players have to be a part of an organization to enjoy most of what Alien Invasion has to offer. With organizations -- the Anarchy Online version of a player guild -- groups of players can ally under a shared banner to partake in the two major additions that Alien Invasion has to offer: player-created cities, and the alien attacks.
But there are other, more subtle changes introduced in the Alien Invasion expansion. For one, there's some new GUI functionality, which includes the ability to sort inventories, a new chat interface, and on-screen windows that can be docked wherever you like. Nano programmers, engineers, pharmacists, and other trade-skill gurus can make use of a new trade-skill interface that displays the ingredients and resulting end product before a combine is made, taking a lot of the guesswork out of experimenting with the game's incredible array of seemingly useless knickknacks and doodads.
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