For all the "use chromecast/Apple TV/Miracast", this might be helpfull as to why it isn't the same http://images.indiegogo.com/file_attachments/213408/files/20...
Also, the guys chanting DLNA, does that work on other things than windows? I've never heard of it, so, have little knowledge of it. Also, I will take a stab in the dark and guess the muliple monitors part and sharing your screen on others computers isn't quite a thing of DLNA...