nope - doesn't install
I just tried installing the Safari update on my MacBook but Software Update boaked - says it has the wrong signature, somebody's tampered with it since it was signed by Apple.
A new version of Safari tackling numerous security bugs was published on Wednesday, just two days after a major operating system update from Apple. Both the Mac OS X and Windows versions of Safari need updating to version 4.0.4 1. The latest version of Apple's browser software tackles various remote code execution, system …
...is that it's like Windows.
Internet Explorer uses the Trident rendering engine. Trident sits in the OS and gets updated when Internet Explorer gets updated. Therefore updating Internet Explorer a restart.
And many apps use Trident to parse and present information, not just Internet Explorer.
In editing my previous post, I accidentally omitted the word "requires."
"Therefore updating Internet Explorer [requires] a restart."
I'll admit that *nix doesn't require as many complete reboots since daemons are generally easily stopped and restarted when necessary, and some modules can be loaded into or unloaded from memory without stopping anything significant, but Windows is getting better about requiring restarting the PC for updates though.