Dual monitor on 2013 imac

I just got a new 21" iMac and was hoping to add a second monitor.  All instructions I've come across so far tell how to do it with with the older iMacs that have the mini display output on the back.  Can anyone explain to me how to do it with the usb/firewire/other available ports?
Thanks!

It works exactly the way it did on the iMacs with the Mini DisplayPorts; Thunderbolt is backwards compatible without any additional hardware.
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