The Internet Explorer web browser uses ActiveX controls for plug-ins such as Adobe Flash, Sun Java, Apple Quicktime and more. ActiveX controls, like other types of objects in Windows, are identified by globally unique class IDs. CLSIDs are used for embedding ActiveX controls in other locations, for blacklisting ActiveX controls so Internet Explorer doesn’t load them and for other purposes. Internet Explorer doesn’t show CLSIDs in its main window because they’re not of use to most users, but you may find the CLSID of ActiveX controls loaded in Internet Explorer using the Windows registry. Writer Bio
