My idea is to create three webpages. One serves as a display page, the other two serve as remotes that change the images in the display page. I wanna all the changes happen in real time in the display page. Is this achievable in HTML webpage? If so, what language or languages are needed? Can JavaScript alone achieve it?
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Have a look at http://xsockets.net, if you are running on .net there is a set of samples included in the Nuget-Package that can help you out. You can also use just a JavaScript API of XSockets.NET and a Cloud Hosted Service called http://live.xsockets.net