The Windows 2000 shell allows third-party applications to add overlay<br>icons to file and folder objects without replacing the entire icon. <br>A shell icon overlay identifier handler is implemented by creating an<br>OLE COM InProc server that implements IShellIconOverlayIdentifier. The<br>IShellIconOverlayIdentifier methods are used by the shell to obtain<br>overlay icon and priority information and to determine if the item's<br>overlay should be displayed for a particular object.<br>