This reference manual serves as the definitive technical guide for utilizing ResEdit version 2.1 to modify and create Macintosh system resources. Apple Computer Inc. provides this documentation to assist developers and advanced users in navigating the resource-editing environment. The text outlines the specific functions, dialog structures, and interface customization capabilities inherent in the software, establishing a standardized framework for resource management.

Experts and developers recognize this as the foundational documentation for the ResEdit utility during the classic Macintosh era. Users frequently note the technical density of the prose, which is designed specifically for programmers and power users requiring precise operational instructions.