No, but there is a more general example/discussion that shows how to use National Instruments ComponentWorks ActiveX controls in an interactive webpage that should show you what you need to know.
Note though that you won't really create a webpage that directly controls your gpib interface, but rather the webpage will be able to send information via DataSocket back to a controlling app, which is the one that would really be interacting with your ENET/100.
More simply, you have a Visual Basic ActiveX control you design that has ComponentWorks UI controls embedded within it and you put this aggregate control on your webpage, you then use DataSocket to send information from these controls back to a Visual Basic application you design that has a one to one UI relationshi
p with the controls on the webpage and you will have a ComponentWorks GPIB ActiveX control in the app that manipulates the ENET/100 based on the information your web controls send to the app controls. This is just a general scheme that is probably the easiest way to implement what you described.
You can find the document that I mentioned above here: http://zone.ni.com/devzone/devzoneweb.nsf/Opendoc?openagent&09EA1720BD3AEFBF86256869007B02D0