I believe what you want to do would potentially best be done via a Mash-up potentially using an iFrame of the entire sheet view etc.
The only way not using that option I believe would be to open 3 copies of the app, one for each monitor, but that is going to be 3 different sessions, so any selection done in one will not transfer to the others unless you were to click on those etc. Given same user/same app, the click should update the other views at that point from playing with this in the past.
Here is a link to the SDK/API area for QlikView if you want to look into Mash-up etc.
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