Intro is encoded with a serial number that is stored in the Intro Key file. Each Macintosh that runs Intro must have a Intro Key file in the System Folder, but several copies of the same key file may be used by several different Macintoshes at the same time. Only a limited number of computers may use copies of the same key file. Consult the Intro package or the release notes that came with your Intro disk to see how many different Macintoshes may use copies of your Intro Key file. Each original Intro package comes with a unique key file. If you need to run Intro on more computers than your key file will support, you must purchase additional copies of Intro.