insert text into IE form fields (gator\roboform)

I have implemented IE activex via ATL so my app can access the web and show web pages. I would like to have the ability to insert text into form fields on web pages (name, address, etc...) I would also like to be able to click buttons on pages or to submit forms. Any ideas? Something very similar to Gator and Roboform. I'm just not sure how to "infiltrate" the control or even IE to achieve this.

Please, no MFC! I'm still in the early learning phases of VC++ and would like to stay away from MFC for now.

TIA!