HomeGroup is a new home security feature of WIndows 7. HomeGroup resemble how you protect your home (an analogy I use in the Mac OS X Security book as well): Keep the outside doors locked and keep the interior doors unlocked (unless you’re on the crapper). HomeGroup can be initiated by any Windows 7 version other than Home Basic and Starter editions. Any Windows 7 machine can join a HomeGroup though and it is not a backwards compatible feature, meaning that if you’re still running Windows 95, 98 or Millineum don’t bother to upgrade (you probably can’t read this site anyway). But 2K to Vista, you gots’ta upgrade to play…