While I’m sharing emacs hacks, I finally got around to researching this and/or figuring it out. I almost always run emacs inside the terminal in a “no window” mode. It’s pretty natural for me to use M-w to copy something from emacs and then try to Cmd-V it in another Terminal window or likewise Cmd-C something in Terminal and then try paste it into emacs with C-y. Until now, I haven’t known how to