An operating system should NEVER allow ANYTHING of this nature (stealth, hidden processes) to install to begin with. Just another example of the @$$inine nature of M$'s approach to things.
From an OS design perspective, it is actually simple to disallow any such activity. In fact, the only reason such a loophole would exist would be for the OS manufacturer to be able to hide some of their own stuff from the user, which is also offensive. This "philosophy" dates back to the classic arguments about M$ having hidden methods of talking to the OS that they don't reveal to other licensed partners, so that M$ can maintain a competitive advantage in application development. It just took this long for it to become really obvious to the rest of us just how insidious this approach can be.
It just really chaps me!
