* Use cross-platform 'Yes' when you have a removable device, like a Yubico key, which you would want to use to login on different computers; say 'No' when your device is attached to the computer (in that case in Windows 10 1903 release, your login is linked to Windows Hello and you can use any device it supports whether registered with that device or not, but only on that computer). The choice affects which device(s) are offered by the browser and/or computer security system.