I don't have a specific example but you'll want to call the ExecWB method with the OLECMDID (which you've already figured out) and the parameter(s) that the ZOOM command needs. Which you can find at http://msdn.microsoft.com/en-us/libr...=vs.85%29.aspx.

Now that I think about it though, that functionality is really for embedded OLE documents. I'm not sure how Shell.Explorer will interpret it (if it supports it at all).

What are you trying to do? Provide a way for the user to zoom in/out on the HTML that you've loaded into the browser instance?