Before you begin reading about how to create IPF communication objects and related topics (such as application-controlled windows), you need to be familiar with the terms which will be used to describe them.

acviewport

The :acviewport. tag, which enables an application to control what is displayed in an IPF window (see :acviewport. (Application-Controlled Window)).
application-controlled window
The window that you create using a communication object that is loaded by an :acviewport. tag.
communication object
A child window of the object window; this child window can handle and respond to messages (particularly HM_ messages).
DLL
A dynamic link library (DLL) is a collection of executable programming code and data that is bound to an application at load time or run time, rather than during linking. The programming code and data in a DLL can be shared by several applications simultaneously.
entry point
A function called in the DLL that contains your communication object. Specified in the :acviewport. tag with the objectname option.
object
For the purposes of this discussion, synonymous with entry point.
window procedure
Code that is activated in response to a message. The window procedure controls the behavior and appearance of its associated windows.

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