Programmer's Online Companion Volumes I-V, is the first tool for developers that provides immediate access to "Inside Macintosh," and the "Apple Numerics Manual." It facilitates fast, error-free source-code development by allowing users to search the volumes for essential bits of information quickly and easily. Programmer's Online Companion is a disk-resident reference that is accessed from the user's development system. It takes up 5K of memory and can be added to, modified, and reconFIgured until it becomes a natural extension of the programming process.