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How do these work? Is it like going to the tiny settings menu and swapping the source on a monitor? I know the HDMI standard includes a way for an input to "request" a source to switch to it, are monitors with multiple inputs smarter about that sort of thing?

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Yes, go to the monitor's settings menu and swap the source. Takes only a couple of seconds with practice at least for the Dell models that I use. Their UI has switching source as a top level option, probably because of the large number of inputs they have. You can check the user manual for the monitor to verify the complexity before purchasing.

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