There are another way to load MSHTML documents without use Application.ProcessMessages?

To load a document into a IHTMLDocument I need to do this:

while Doc.readyState <> 'complete' do 
   Application.ProcessMessages;

I want not to process all the message queue during the loading, because I would be changing my application flow, in other words, some messages that should be processed after the loading to be completed can be processed earlier, even before the loading end.

There is a special message code that the IHTMLDocument expect to advance in the loading process? Or there is another way to load?

Thanks.