Swap between iMac 27 & Video Input? How?

[powerbook911]

If I connect my MBP to iMac 27-inch via mini display port, it works perfect.

However, I can't get back to the iMac's own computer, without unplugging the display port on the back of the iMac.

Is there a way to easily toggle between the iMac's own internal computer video and your mini display port input on the back?

Thanks

[Milty77]

not 100% sure as i havent done it before but i think its command & F2

[juliancs]

Yea, command + f2
:)