“Ok I have 3 tv's I want to hook up to show what is on my computer all at same time Would I have to buy 3 dongles and hook them to each tv?”
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You would have to have Cromcast dongles on all tv's that did not have cromcast built in. Even then, when you want to cast, a list of all devices you have that have cromcast is shown and you pick only one that you want to cast to. Sorry.
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