Which technology enables access to all of the logged-in user's capabilities on a computer?

ActiveX controls are technologies that enable robust interactivity in web applications and also allow programs to run on a computer with the full capabilities of the logged-in user. They can interact with the local operating system, access files, and perform various functions that are usually restricted for web applications. This deep integration with the user’s permissions and the operating environment makes them particularly powerful for applications that require such access.

Java applets, while capable of running on user machines, are typically sandboxed and do not have access to the local file system or the same level of permissions for security reasons. Active Server Pages (ASP) is a server-side scripting technology used to generate dynamic web pages and does not run on a client’s machine. Microsoft Silverlight is a deprecated framework for building rich internet applications but operates in a sandboxed environment with limited access to system resources to enhance security.

Given these characteristics, ActiveX controls stand out as the technology designed specifically to enable access to all capabilities of a user's machine, aligned with the required capabilities of the logged-in user.