This week a new Steam client update rolled out, and then was updated and rolled out again with a workaround for a crash related to AMD drivers in Windows. Among the many notes are a couple of interesting things involving the Steam Link:

You can play local co-op by streaming to multiple devices simultaneously (high quality 5 GHz WiFi network required)
You can use your Android phone as a touch controller for games by tapping to disable audio and video in the Steam Link app

The thought of trying to control Overcooked with a phone sets off my panic response, but new options for playing games with friends are always welcome.

Among the other updates to the client are tweaks to Steam chat, which will no longer try to start if you're in offline mode and now has an option to test your mic in the Friends Voice settings dialog. Fixes for Big Picture mode and some gamepad issues are also included, so if you were trying to get Nintendo Switch controllers to play nice with Steam but they stopped working every time the rumble went off, that's been solved now.