This reference guide serves as the definitive technical manual for developers tasked with implementing HP-GL/2 and HP RTL protocols in software applications. The authors, engineers at Hewlett-Packard, provide the necessary specifications and command structures required to interface effectively with HP printing and plotting hardware. The text functions as a primary technical resource for understanding the syntax, data formats, and operational constraints of these specific graphics languages.

Experts and developers recognize this manual as the foundational technical authority for legacy HP printing protocols. Readers frequently note the high density of technical specifications and the necessity of this text for maintaining compatibility with HP hardware systems.