32.4. Interacting with the Host
In the current example, the host is in complete control of the add-in. However, the relationship is often reversed. A common example is an add-in that drives an area of application functionality. This is particularly common with visual add-ins (the subject of the next section), such as custom toolbars. Often, this process of allowing the add-in to call the host is called automation.
From a conceptual standpoint, automation is quite straightforward. The add-in simply needs a reference to an object in the host's application domain, which it can manipulate through a separate interface. However, the add-in system's emphasis on versioning flexibility makes the implementation of this technique a bit more complicated. ...
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