There are two methods of input for the n800:

1. On screen touch keypad which has two versions. THe default one is a small one which appears on the base of the screen. There is another full screen keypad which fills the entire screen with the buttons and larger keys.

2. An alternatvie method of input is handwriting which when selected replaces the onscreen keyboard. Where you write with the stylus but you have to give a little pause after each letter is written so as to make it appear on the respective input field. WHat i am essentially saying is that you u cannot continously scribble letters as there is a millisecond lag where the n800 reconizes what you have written after which you enter the next letter.

All inupt methods have word completion alternatives which i found are quite useful