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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.
OLE custom controls are usually shipped in the form of a dynamic link library with the .ocx extension. In 1996 all interfaces for controls (except IUnknown) were made optional to keep the file size of controls down, so they would download faster; these were then called ActiveX Controls.
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.
VBA can, however, control one application from another using OLE Automation. For example, VBA can automatically create a Microsoft Word report from Microsoft Excel data that Excel collects automatically from polled sensors. VBA can use, but not create, ActiveX/COM DLLs, and later versions add support for class modules.
ActiveX was based on a number of technologies Microsoft had already developed for Windows. ActiveX controls were OLE based controls that could be embedded in web pages, applications, and on the desktop. ActiveX became strongly criticized for security problems, and Microsoft later abandoned further development in favor of the .NET Framework.
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.
Microsoft Access may also be part of a more complex solution, where it may be integrated with other technologies such as Microsoft Excel, Microsoft Outlook, Microsoft Word, Microsoft PowerPoint and ActiveX controls. Access tables support a variety of standard field types, indices, and referential integrity including cascading updates and deletes.
Internet Explorer 4 and later allows the blocklisting [34] [35] [36] and allowlisting [37] [38] of ActiveX controls, add-ons and browser extensions in various ways. Internet Explorer 7 added "protected mode", a technology that hardens the browser through the application of a security sandboxing feature of Windows Vista called Mandatory ...