Multi-Threaded Webbrowser Application

Need a multi-threaded webbrowser vb.net application which has the following 1. must suport proxy settings on a component basis (note that they will be imlemented in separat threads if this helps) 2. Execute the Javascript/Ajax etc on the Page 3. must suport postdata editing before the request is sent (not very much important, but then filling of forms would be needed, like DOM support etc) 4. triger the download of media and all necessary content of the page (however a visual rendering is not mandatory) <- not very important 5. start, kill and pause threads 6. login to the same website with different ids on different webbrowsers inside different threads 7. option to select browser eg. chrome, ie, firefox More details on request! Thanks