I am about to change job and at the job where I am now they let me use the forum but where I will go they are not that user friendly in this regard.
Is there a way to make a webpage invisible through a keyboard command, I mean making it completely disappear from the screen and to use the same keboard command or combination to bring it back ?
You can use the free version of the Windows Hide Tool.
Here's the link.
http://www.window-hide.com/Most employers monitor web usage though so I'd still remain careful.