In my experience, even if you had to enter a password for the
application, you'll just be asked for it again. So even if you lose
the kernel extension, you should still be able to use the
application. and if you are doing "archive and install" any
preference files and/or plist files in your home Library directory
should be saved. I've reinstalled a few times and haven't had any
problems except that I had to re-enter my password for realplayer and
skype, but not knowing what apps you have on your computer I'm not
trying to say for sure you won't have any trouble.
I also keep my disk images for applications so that if I have to
reinstall for some reason and some disaster befalls the application,
I don't have to go download all over again. I also keep a list of my
third party apps so I can make sure everything is really there after
a reinstall.
--
Cheryl
"Where your treasure is,
there will your heart be also".