Hi to everybody

I need some help with video configuration
I'm using kde 3.5.10 on a Debian Lenny with xorg from backports and nvidia proprietary driver (195.36.15) on my laptop

Nowadays I have received a 2nd monitor, end my purpose is to attach it to my laptop.
TwinView or separate X screen work fine but clone or extended view modes for my mind are not so usefull.

I think there is the possibility to assign one virtual desktop to one monitor and another adjacent virtual desktop to the second monitor

Has someone any idea how to obtain this kind configuration,
also some key words for google asking are appreciated.

thank you very much