I recommend adding a slide on how you are doing this for educating those of us who do not know. From a high level, I assume the logins are detected via cookies.

I recommend adding a slide on how you are doing this for educating those of us who do not know. From a high level, I assume the logins are detected via cookies. Edit: interesting! Its by checking if favicon images would be loaded. Edit 2: Found this old thread by hoppinh through webkay https://news.ycombinator.com/item?id=11415462 https://news.ycombinator.com/item?id=11415462