The specification is only 3 lines long. Yet it doesn't work — Calling a local app from a browser extension

Browser extensions live inside a box.They can touch the page's DOM. They can peek at network traffic. They can have storage. But they cannot "launch an app installed on this PC." That would be a major ...
Ars Technica

what's the difference between 0,1,2 and stdin, stdout and stderr?

many texts use them interchangeably, but they are not equal. stdin, stdout and stderr all seem to be > 2^30 on my system (linux). i can use 0-2 with dup2(). i can't use stdin/out/err because it ...