How to open a webapplication in full screen mode

Create a windows form application project

drag the web browser control in to the form

goto web browser properties

select Dock = Fill

Select the form

Goto Form properties

Select TopMost = True

FormBorderStyle = None

WindowState = Maximized

Update the url in webbrowser

And update your backgroud codes

after log in you can open a new browser window.
please check bellow article

http://stackoverflow.com/questions/19355370/how-to-open-a-web-page-automatically-in-full-screen-mode[^]
http://stackoverflow.com/questions/5214167/how-to-open-a-webpage-in-full-screen-mode-ie-automatically-and-the-user-can-st[^]