How do Windows and Apple devices know that they "need to open a web page to complete authentication" when connecting to wireless networks?
For example, I connect to an unsecured, open network and Windows pops up a balloon notification telling me to open a browser.
When an Iphone connects, they open a separate Safari window which then closes once you have gained full network access.
I'm running a capture but have no Apple device to test with. Is this documented anywhere?