How to use the Discord overlay to chat and take calls while gaming

You can use the Discord overlay to chat with friends while playing games. The Discord overlay is only available on Windows ...
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Steam's new in-game overlay offers some useful upgrades - and I'm particularly happy about one that exposes a controversial AI trick

Steam is upgrading its in-game frame rate counter to be a full overlay This will provide a lot more details on what's going on under the hood with any given game, and your CPU and GPU's status too ...