Most likely you have on your PC some ActiveX controls, which are part of your operating system or the software you have installed. For example, if you have installed Microsoft Internet Explorer, you will have the Web Browser ActiveX control. You can embed this control in your form to integrate IE web-browsing functionality in your application.
Most ActiveX controls are purchased separately from a variety of vendors. Many of them can be obtained from Web sites and you can usually download them for evaluation.
ActiveX controls need to be installed on the PC, and usually the controls come with installation instructions. During the installation, information about the control is recorded in the Windows registry.