Progress
Language Tutorial
for Windows
Using Windows with Persistent Procedures
Although this tutorial does not cover multi-window applications, it is important to point out that persistent procedures are a very important part of implementing this kind of application. If a window needs a WAIT-FOR to allow user interaction, and you should only have one active WAIT-FOR at a time, how do you implement multi-window applications short of having a huge main procedure?
A window established by a persistent procedure will remain available to the user while the context of the procedure that created it is still active. You need to control the creation and deletion of the window and all communication between windows. For a complete discussion of using persistent procedures for multi-window applications, see the Progress Programming Handbook .
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