I'm thinking of buying an extra monitor for my 21" iMac, since I could really use the extra space. Of course a Thunderbolt Cinema display would be ideal, but I sadly can't afford it, so I've looked into some alternatives. http://www.amazon.co.uk/AOC-I2757FM.../ref=cm_cr_pr_product_top/275-0512719-4025725 This^ is what I've decided to go with. But how will I connect it? I suppose it uses HDMI, which the iMac doesn't have. I already have en adaptor (thunderbolt to HDMI), will I be able to simply use that to connect them? And how will it work in practice? Will it automatically be used as an extra desktop?