This text serves as the foundational technical orientation for developers and engineers seeking to understand the architecture and capabilities of the Apple IIGS personal computer. The authors, representing the engineering staff at Apple Computer, provide a structured overview of the system's hardware and software environment. By establishing the baseline specifications for the IIGS, the book enables programmers to effectively design software or port existing applications to this specific platform.

Experts and historical computing enthusiasts recognize this as the primary documentation for the IIGS launch era. Readers frequently note the technical density of the prose, which is tailored specifically for professional developers rather than casual users.