When a client enters the grid , such as a PDA , it has to be able to communicate to the other users that it is a PDA .
It has a camera , GPS capabilities , a telephone function and various office applications such as a text editor .
When a client enters the grid , such as a PDA , it has to be able to communicate to the other users that it is a PDA and it has a camera , GPS capabilities , a telephone function and various office applications such as a text editor .