<font color=blue>Ambiguous question.
Do you mean that you mean you want to duplicate what is on your laptop screen over four monitors (easily done) or see four independant sceens with different stuff on each screen therefore giving you a monster-sized desktop.
Duplicating a vga signal is <A HREF="http://www.iec-usa.com/adp5204.html" target="_new">easily done</A>. Increasing your desktop to two monitors is something that was introduced in early 90's but brought to mainstream with win 98 provided a second pci video card on hand, or of lately a v-card that supported it. I imagine there is a way to go to four (Crash, any ideas?), but why on a laptop?
<i><font color=blue>on company time....</i>