Thanks...followed the Wikipedia link to the Rob Cox demo video. Mind blowing to have an editor as an OS filesystem that can intercept OS events. If I hadn't spent the last 20 years learning vi I would grab a copy and give it a try.
Russ Cox, not Rob Cox. You may be intermingling Rob Pike and Russ Cox, who are both involved in Acme.
Yeah, plan 9 did a lot of cool things and fixed many of Unix fundamental warts. Taking the "everything is a file" much further, and namespaces as a fundamental primitive rather than something bolted on afterwards, for starters.