When I invoke Hook with multiple Noteplan windows open, it shows only the most recently opened window (even if I have another window in focus). What it “feels” like from this user’s perspective is that Hook assumes that I want to link to the most recently opened Noteplan window even if a different window is in focus when I invoke Hook. I can reliably repeat this behavior by opening any note in a new window, switch back to the main Noteplan window, and then using the Hook keyboard shortcut. It will show the window I had just opened.
Noteplan is able to distinguish between its own windows in its own menus (for example, if I use “Note->Copy Link to Note” in Noteplans menu, it works properly with different windows in focus). This makes me think that maybe it’s an issue with the Hook integration. But without knowing all the details, it’s hard to tell. I also emailed the Noteplan developer about this.