[SideburnsOfDoom]

The point that observer1101 is almost certainly trying to make is that "Apps run operating systems" in the sense that deploying an app oten entails creating a VM for the sole or partial purpose of hosting that app. The app dictates the OS, not vice versa any more. And observer1101 is right - that trend may have had a minor beginning in 1999, but it has grown very strong since. Azure or AWS is basically the business of running operating systems in VMs on demand for apps.

[yohanatan]

Yes, I fully understand and agree with all of that. However, I think it is still not accurate to say that apps run operating systems. More accurate to say that apps embed operating systems or are themselves bundled with operating systems (such that they can run on bare metal). And, MirageOS (http://www.openmirage.org/) takes this concept to its logical conclusion.