Release 10.1A: OpenEdge Development:
Progress 4GL Handbook

Advanced Use of Procedures in Progress

In Chapter 2, "Using Basic 4GL Constructs," you learned how to write both internal and external procedures. In Chapter 3, "Running Progress 4GL Procedures," you learned how to use the RUN statement to invoke one procedure from another. There’s a lot more to using procedures in Progress, however, and this chapter covers these additional topics. You’ll learn how to:

Treat procedures as objects with standard behavior and independence from other procedures.
Build what amounts to classes of behavior using multiple separate procedures that all contribute to the definition of the application’s behavior.
Use procedures in ways that go beyond the top-down calling sequence you’ve been introduced to.

It includes the following sections:

RETURN statement and RETURN-VALUE
Using persistent procedures
Shared and global objects in Progress procedures