From "How to Use the Netbook":
PLAYERS
If you are a player looking for a different race to play, this is a good place to start looking. The netbook provides you with a wide range of races and most of them even have their own equipment or spells.
But before you start building your character, make sure that your GM allows the race in his campaign world.
A new race can have a great impact on a setting and your GM always has the final say in the matter.
GMS
If you are a GM, you shall be thrilled to find all these races that help you to create a unique campaign world.
The detailed backgrounds make it easy to implement a race into any existing setting and can inspire you for new adventures. If you are not happy about some elements of a race, feel free to change them; after all it’s your game!