On the double screen issue, my experience is a bit different than with the you tube video above and may have to do with difference in Chromebooks, but I am not sure.
But the method that works is if I open two tabs on the screen of my chromebook and at the very top of either tab just left of the little x I place my cursor and hold down the left click button at the same time move with my touch pad the entire tabbed page to the next screen. I can then work on the AC user board and stream in Netflix on the 22 inch TV screen while I work.
Also, as robtweed suggested in his article above, I think 2 step authentication is a must. I had not heard of this but implemented this extra precautionary measure, so that if anyone else obtains my password to my gmail account, he will also have to have my phone and get the 6 digit # texted to my phone when he signs on with the password. Unlikely to occur without my help, so lessens the risk of unauthorized users of my gmail/chrome account. Using the chromebook in the office changes how I use my gmail on other devices, I will use the chrome browser on other computers not mine, but will not sign to gmail unless either on my chromebook or my office computer. I also disabled my gmail account on my phone. These are just steps of extra security I am taking personally, probably just being paranoid, but.....
