You can find an example in the demo Features.exe. How to download the demo: http://www.atozed.com/intraweb/download/IntraWebDemos.EN.aspx
In the form ActiveXForm.pas there is a TIWActiveX component.
Set the Properties to
<TIWActiveX>.ClassID:= 'clsid:C1A8AF28-1257-101B-8FB0-0020AF039CA3';
<TIWActiveX>.CodeBase:= '/Files/mytest.ocx';