How it works: That highly leaded UNIX runs as the core of your operating system. You never have to touch it or know that it is there until you're ready to dive in via the Terminal command line.
Who will use it: UNIX certification is fab for hardcore geeks. You can deploy all sorts of goodies that demand that 100% purebred UNIX-y atmosphere. It's like getting a perfect greenhouse for your exotic orchid collection. Assuming, that is, you're some sort of computerized version of Nero Wolfe.