Hi!
I believe so
but I also think it depends on your graphic card. You maybe need the linux specific driver. It should come with documentation;
Do you want cloned monitors or just two independent screens?
Depending on what you want look for cloneview, twinview, tv-out, multiple X screens, ...
You also should check the X server configuration (man pages of XFree86, XF86Config..., and references therein.
Regards