Section I serves as an introduction to the concept of common memory. It identifies the purpose of the accompanying software collection, and lists the personal computer (PC) configuration prerequisites of the PC common memory software library. Section II provides an overview of the common memory architecture defined by the Automated Manufacturing Research Facility (AMRF) of the National Bureau of Standards. Section III specifies the PC common memory architecture. Section IV is the programmer''s reference section. The various appendices provide detailed support information for the use of the PC common memory program library. Included are data structure definitions, a sample program and associated output, and the complete source listing of the PC common memory library.