Cloning display over multiple monitors

I am developing an educational software solution where I need to clone the screen of one computer on 开发者_运维百科5 or 6 LCD screens. The screens would be 15-20 feet apart.

Is there any hardware or software that can help me do this? Each screen will just replicate the screen of the computer. I basically need to split and duplicate the video & audio signal.

I need the solution for Windows or Linux (any one) on the computer. The cloned display screens have no software - they are just LCD TVs.

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