user_login

Username of the current Wordpress user is stored in this global variable. It is set using the cookie in the pluggable functions set_current_user($id, $name='') and get_currentuserinfo() defined in [wordpress root folder]/wp-includes/pluggable-functions.php.

It is used to get userdata using the username., e.g., $userdata = get_userdatabylogin($user_login);. The plugin and theme authors need not use this, as the user data is already available in the current_user and other global variables..

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Technorati tags: user_login, current_user, username