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MMC provides a number of COM interfaces for use in developing snap-ins. Snap-ins implement some of these interfaces and expose them to MMC. MMC implements the remaining interfaces and exposes them to snap-ins to use. As a result, much of the functionality you are likely to want for your snap-in is already available to you.
MMC creates instances of your snap-in as required and calls the methods of the interfaces that your snap-in exposes. In turn, your snap-in can call the methods of the interfaces that MMC exposes, thereby incorporating features such as toolbars, context menus, and property sheets.
MMC implements the following interfaces:
IColumnData (new in MMC 1.2)
IHeaderCtrl2 (new in MMC 1.2)
Snap-ins implement the following interfaces:
IResultDataCompareEx (new in MMC 1.2)
Depending on the features you want, you may not need to use or implement all of these interfaces in your snap-in. Other sections of this overview refer to these interfaces and their methods frequently, so familiarizing yourself with them now may be helpful.