Best way to Double-Buffer a Screen?

[Michael Ethetton]

I'd like to know the best way to double-buffer a screen for a game.

I'm drawing to an offscreen window.  Show I copy the bytes from the
offscreen window to the screen, or should I use set the Starting Screen
Address (vSSA) to the new window?

I've tried switching the window by changing the Screen Address, but I seem
to get a blinking effect, like the LCD is shutting down for a little while
before displaying a new screen.  Can this be circumvented?  Or should I just
copy the memory?

Thanks,
Mike