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That is not quite reality. If I plug in an external DVI display to my MacBookPro, it flashes briefly, then activates the external display, reconfiguring the Displays pref pane on the fly. I can move the mouse across both displays. I unplug the display, and the system resets to the former internal display, and mouse is controlled inside that screen space. Takes about 30 seconds to complete each connect or disconnect. I didn't feel comfortable with doing this at first, but seems to do no harm. The process is not perfect, and the displays occasionally get confused when coming out of sleep.
I use a DVI display - a projector or a TV may function differently in the auto-sense circuitry.
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