I know we never ever have to restart OS X. It's just, when I <B>do</B>, for all sorts of very boring and incompetent reasons, I often find that the process is aborted because (so a dialogue informs me ...
I googled a bit for this but didn't come up with anything definitive - why does my iMac have to restart for a safari update? What exactly is in use or blocking update that can only be accomplished on ...