IMac Mini DisplayPort

I have a 27" iMac with a mini Display port.
My work laptop is a HP Elitebook which has a Displayport on it.
Can i use my iMac do display my HP laptop display with one of the cables available...
http://www.ebay.co.uk/itm/2m-Mini-DisplayPort-Display-Port-Cable-Lead-Mac-Apple- air-Macbook-Pro-/140684417274?pt=UK_Computing_Apple_Mac_Accessories&hash=item20c 171d8fa#ht_1409wt_1240
Has anyone done it and at what resolution will it work..
Thanks

Well it does work, output from my HP windows 7 laptop and use my iMac as a display and get sound via display port cable.

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