It's not just limited to dragging windows around. The mouse-clicks get passed to the background app. You can use it with anything. It's called click-through and

It's not just limited to dragging windows around. The mouse-clicks get passed to the background app. You can use it with anything. It's called click-through and has been around for a long time. I first learned about it here: https://duckduckgo.com/?q=click-through+site%3Adaringfireball.net&t=osx&ia=web https://duckduckgo.com/?q=click-through+site%3Adaringfirebal...