Client Server Architecture Question:

SAA is a collection of selected software interfaces,
conventions, and
protocols that are used as a framework for developing
consistent,
integrated applications across the major IBM computing
environments.

Four major components of this architecture are:
- Common User Access (CUA) defines conventions for GUI
look and feel.
- Common Programming Interface (CPI) provides languages,
tools, and APIs that give applications greater portability
and more consistent user interfaces across multiple
platforms.
- Common Communication Support (CCS) supports existing
communications standards, such as LU 6.2.
- Common Applications, written by IBM, will serve as
demonstrations of SAA concepts and make it easy for users
to migrate between systems.