Hello, i´m goanna explain how to connect from your computer to your N900.

First we need to know whats your root password.
Login as root in the terminal (console) on your mobile.

Run this command;
Fill in your password two times.

Now you've set your root password.

Download a SSH client (i used Putty)

On your N900 type;

you will see wlan0 somewhere and inet addr:.

The adress behind the inet addr: is your local IP.
Example i have 192.168.111.8

Go to Putty or some other program and fill in your local IP.

Fill in 'root' as username and your password.

Now you have acces from your PC.

Thanks but:
http://wiki.maemo.org/SSH
http://talk.maemo.org/showthread.php?t=41547