Sharing HT computer monitors

I have my HT computer in the same room as a 92 inch screen. I use my "HT" computer for paying bills, programming remotes, etc. I'd like to be able to allow my children to watch a show while I'm doing something else on my computer (which has its own monitor).

I can extend the desktop onto both my computer's monitor and my 92 inch screen. However, when I put the windows media center's window on the 92 inch screen, then maximize the WMC window, my mouse pointer gets stuck in the WMC window, and I can't get it back to the desktop on my computer's monitor.

Is there a way to maximize a WMC window on one monitor, while still allowing me to use my mouse in the other monitor? Thank you.

Thank you very much. The keyboard I'm using does not have a windows key. (I have to use a small keyboard, so there's not even a number pad.)

I can resize WMC to the window, and on a 92 inch screen the size isn't bad (obviously). It's just it personally drives me crazy to see the window, but my daughter doesn't seem to mind.