Read my comments above where I post references to how and why this is done. Some systems do
not have the luxury of someone physically going to install new software and flicking a switch.
When applying a HOT-PATCH you do want to ensure that the patched area is not cached or some
intensive application is going on. The ideal way is to send the computer to some idle state
(some sort of idle loop), do the patch and transition from the idle mode.