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The latest version of this topic can be found at Trackers: Implementing Trackers in Your OLE Application.
Trackers provide a graphical interface to enable users to interact with OLE client items. By using different tracker styles, OLE client items can be displayed with hatched borders, resize handles, or a variety of other visual effects. This article describes:
The article also covers the use of styles with trackers. In addition, it makes several references to the MFC OLE sample OCLIENT.