The user name can use Chinese characters, letters, characters, etc., such as Mount Everest, zmlmf, 12345, etc.
The login account name is the identification code of the website where it is located. as username. Generally speaking, any website that allows users to register will have a "Registration" label prominently placed on its homepage to allow users to apply. As long as it complies with its regulations and other users have not registered this name, you can register; if the name has been registered by others, you will be prompted. In this case, you can only apply again until the registration is successful. Internet usernames, the most common ones include QQ, E-mail, blogs, forums, etc.
Extended information:
In order to prevent others from illegally logging into Windows XP through the user name in the welcome screen, we can hide the user name like this:
Open the "Registry" Editor", expand the branch "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList", then find the user name you want to hide in the window on the right (if not, create a new one), and add it Set the value to "0" (set to "1" to display the username). After logging out or restarting the computer, the Username will be hidden from the welcome screen.