Well, chances are you'll fold the cover around the back, like you would with an iPad, and start using it while holding it in one hand, like you would with an iPad, and if you click on a text input area, a keyboard will pop up, like it would with an iPad, and you use the on-screen keyboard... just like you would with an iPad.
Hey now, stop making sense.
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Some additional hands on:
http://gizmodo.com/5919459/hands-on-with-microsoft-surface-for-windows-rt