Is there any way I can be ABSOLUTELY certain that there are no leaks/holes either into or out of my iBook? I've enabled the OS X firewall, but I'm wondering how to configure it properly and also, even if it is configured properly, is it completely secure? I would like to seal up my computer airtight...at very least, I would like to be notified/asked when there is any movement in or out of the computer...any ideas suggestions as to what I should do? Thanks!