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Later versions of Internet Explorer prompt the user before installing an ActiveX control, allowing them to block installation. As a level of protection, an ActiveX control is signed with a digital signature to guarantee authenticity. It is also possible to disable ActiveX controls altogether, or to allow only a selected few.
Documentation for ActiveX core technology resides at The Open Group and may be read for free. [15] Despite Microsoft's previous efforts to make ActiveX cross-platform, most ActiveX controls would not and will not work on all platforms, so using ActiveX controls to implement essential functionality of a web page restricts its usefulness.
This utility displays a list of all installed BHOs, browser extensions and ActiveX controls, and allows the user to enable or disable them at will. There are also free tools (such as BHODemon) that list installed BHOs and allow the user to disable malicious extensions.
Active Scripting (formerly known as ActiveX Scripting) is the technology used in Windows to implement component-based scripting support. It is based on OLE Automation (part of COM ) and allows installation of additional scripting engines in the form of COM modules.
The ActiveX control is downloaded on the first validation and when a new version is available, but the validation itself can be performed any time the user connects to a Microsoft Website to update. On Windows Vista without service packs, WGA validation failure has a greater impact.
IE7 Protected Mode relies on the User Account Control technology. ActiveX Opt-In blocks ActiveX Control unless it allowed to be installed. This feature improves security from unverifiable and vulnerable controls. ActiveX controls can be chosen to be installed on Information Bar. User can turn on and off ActiveX Control by using Add-on Manager.
CAPICOM is a discontinued ActiveX control created by Microsoft to help expose a select set of Microsoft Cryptographic Application Programming Interface (CryptoAPI) functions through Microsoft Component Object Model (COM).
The main purpose of a killbit is to close security holes. If a vendor discovers that there is a security hole in a specific version of an ActiveX control, they can request that Microsoft put out a "killbit" for it. Killbit updates are typically deployed to Microsoft Windows operating systems via Windows Update.