The stage display (used for the rear wall) is a web page. You need a web browser to connect to OpenLP remote stage display.
One option is to use a web browser on your PC, opened in full screen mode on the screen connected to the rear projector.<br>The other option is a separate PC / Android TV box / Tablet with a video output.
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At the moment I have an Android TV box, using a Kiosk Browser App, but may replace it with a tablet, as I can either get the text too small or too large.<br>The projector is failing, so we are discussing whether to replace it or give the stage people a low cost tablet each.