Auto-Login by IP, if no Username/PW is given at BE-Login. Enter IP (or comma-separated IP-List without spaces) for BE User; make sure, that same IP(s) are NOT given to more than one BE-User. Then Click on "Login" with empty BE-Login-Form logs in by IP. Login with other identity is always possible. For Typo3 Version 4.x/6.x only. (For older versions see sg_beiplogin37)