If I have a point in screen coordinate system, how do I get the NSScreen containing that point? More precise, I need to know what screen the origin of my window is on. [myWindow screen] isn’t enough because it returns the screen where the largest part of the window is which isn’t always the same screen as where the origin is on.

I can not imagine that there isn’t a method for this.

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Have you read the documentation for NSScreen? It has a -frame method. You can enumerate the screens and ask each for its -frame and see if NSPointInRect() …

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Yes, this is exactly what I implemented a few minutes after I posted my question. So simple, don’t know why I didn’t think of it sooner.

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Sometimes things aren’t obvious until we read the docs. ;-)