How do I go from dual monitor back to the single monitor setup?

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I have a Dell Inspiron 9300 with an ATI Mobility Radeon X300 with
128MB.  Before I started using a dual monitor setup, I was able to
display my desktop or a program I was running on the built in display,
on an  external display, or on both by using the "Fn F8" control on the

I changed to a dual monitor display and extended my desktop onto the
second monitor.  I now have a need to go back to the original
configuration and, specifically, need to be able to display a running
program on the built in display AND on the external monitor (in other
words, i need both to show the same thing).  I have unchecked the
"Extend Desktop" option and I can toggle between the internal display
and the external display by using "Fn F8".  However, when I activate
both displays, I can only see the desktop on the primary display.

What am I missing?

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