Hi, In the last couple of days, I've been toying with the thought of an operating system in which programs (or more accurately, any process) has a distinct type which limits its use of the machine. For example, `echo` (String -> String) won't be able to print an output without a second program which would handle changing stdout. I think it could "break down" the IO monad into other structures that are better at specifying what is changing: A file is read / memory written / etc. I do, however, not sure how to incorporate drivers (which handles IO and external devices) into this. Giving them an `IO a` type feels like cheating. I would be much cooler if there was a way to treat them like the `echo` function from earlier. What are your thoughts/suggestions? I'll be happy to hear them. Yotam