The Jscript engine is a COM object, and it is instantiated by Trident (mshtml.dll) with a call to CoCreateInstance(). Therefore, the first operation made by the tool will be to intercept the calls to CoCreateInstance made by the mshtml module.
Please check out the blog about this very useful tool, then download the thing and give a try!
Note: There are no details available on how this tool interacts with Internet Explorer 8.0, so please keep this in mind if you are running the beta.
The IE Support team