::The user navigates to the web page in IE and then switches to my VFP app.

If you open IE from within your app, like so:

WITH ThisForm
  .oIE = CREATEOBJECT("InternetExplorer.Application")

  WITH .oIE
    .Navigate("http://levelextreme.com/")
    .Visible = .T.
  ENDWITH
ENDWITH

You'll have access to the entire IE DOM through your oIE object, and your users can still switch back and forth between the browser and your app.