# Publish and Subscribe Overview

If you are using System 7 or later on a Macintosh, Publish and Subscribe will enable you to move data between your models and other applications in a very seamless way. Before we discuss each of the Publish and Subscribe items in detail, it's important for you to get a general overview of the Publish & Subscribe functionality. Figure 8-4, below, provides this overview in pictorial form.

Figure 8-4 An Overview of Publish and Subscribe Functionality

As the diagram indicates, model elements generate data which are recorded on the pages of a Table Pad. Each page may contain only one Publisher - which may be one or more rows or columns on the page. Each Publisher you define will be associated with a unique Edition, a special type of disk file which will hold the data published from the Table page. Subscribers, located both within models and within documents created by other applications, can subscribe to editions created by the software. Models, in turn, can subscribe to editions produced by other models, as well as by other applications.