PPSI is an
object-oriented, message based processing system, which allows
connectivity between applications executing on different platforms.
PPSI supports both the Client-Server and Peer-to-Peer models. PPSI
exchanges information between applications utilizing IBM's APPC(Advanced
Program to Program Communication). Application exchange information
using one of PPSI's three processing modes, transaction, iterative and
deferred. Application developers can build systems that require
communication without having to write communication-specific code.