Can't extend my desktop

I'm using a G4 laptop and want to use a second monitor as an extended monitor. But all I can get is a mirror of my laptop LCD. There's supposed to be a button that says "arrangement" that allows extending, a friend says, but no such button appears on my G4. Does this mean I can't use two separate desktops like the rest of the world can? HELP!!!
PS As a 20-year Mac user I'm not all that happy with the products anymore.

Mac4ron.
If you have a PowerBook, or a MacBookPro, you shouldn't have any trouble using an extended monitor. Might have to set it up in the "Displays" system Preferences Panel.
If you have an iBook, it is a little bit more trouble, but I am successfully running a 19" flat panel at 1280x1024, and my iBook's at 1042x768. to do this, you need Screen Spanning Doctor, which you could search for at versiontracker or MacUpdate. I can also run it on only the external monitor, by getting both screens working, then closing the lid to the iBook, then clickling a mouse button to wake it up again, and use an external keyboard. I usually open the lid after waking it up, to help with cooling. It works great!

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