New, enhanced version; provides for program-to-program interworking; covers one of the three key methods of handling Distributed Transaction Processing; written for programmers and developers; essential reference for CPI Communications; and adopted by the industry as the standard method of working. This document defines the Common Programming Interface for Communications (CPI-C), which is an application programming interface (API) to a Communications Resource Manager (CRM). It provides a cross-system-consistent and easy-to-use programming interface for applications that require program-to-program communication. This document is intended for programmers who want to write applications that adhere to this definition, as well as for developers interested in implementing CPI Communications. The Open Group and Prentice Hall are pleased to join forces to make available some of The Open Group's key works. This title is especially selected by The Open Group and Prentice Hall for distribution through the international book trade by Prentice Hall.