Updates which require you to agree to a EULA will always require manual intervention. Certain other updates may as well. For other updates, if you have automatic updates on the machine in question will eventually take care of things itself, assuming it's
not turned off overnight every night. If you do turn it off when not in use (as opposed to hibernation/sleep modes) and don't tell it to install updates and shut down when there are updates pending, you'll be nagged like this because
you're blocking the standard update mechanism.
As for why you can't remote to the machine to take care of the alert, not all computers support incoming remote desktop connections, not all updates can (or should) be installed through remote desktop, and there's probably a presumption that since it's a
home machine, the alert is easy enough to take care of by walking over to the machine and dealing with it.
I'm not on the WHS team, I just post a lot. :)
