I have mine unchecked. I asked someone about this & here's what he said:
Quote:
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The REST interface is for other apps on the same machine to control or query the client - I'm not sure exactly what features it exposes, but I think it was meant to allow the client to communicate with music players, the web browser, etc.
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So I guess it's up to you whether you leave it unchecked or check it & see whether it gives you any advantages. Since the PE is a Beta version of LW anyway, there's probably no way of knowing whether the option works well or not since documentation from LW isn't available any more.