In short, an IRAF tape, network, or CD-ROM distribution is obtained and installed according to the instructions. The result is a full IRAF system, including both sources and executable binaries for the architectures to be supported. The system will have been modified to reflect the new IRAF root directory and should run, but will otherwise be a generic IRAF distribution. To get the most out of an IRAF installation it will be necessary to perform some of the additional steps outlined in the remainder of this document.