How do I project part of one screen onto a second (dual) screen, ideally with Windows or Linux?
One kind of hackey way to do this
1.) have a screenshot software record the first screen, and mirror it on the 2nd..
2.) use the zoom features of your recording software to zoom in exclusively to where you need to see..
problem is it's going to look funny, depending on how the zoom is implemented. Other than that I cannot think of a way to do what you're asking.