Opening one window in another

In my course, I use an action to open some pages as independent windows, and that works fine.I also have some information that needs to display on those pages in ANOTHER window, also using an action.When I try to do that, the second window just opens into the first, not as an independent window.Is there a way to open a second window as an independent window (with a X in upper right to close) inside an already open window?

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