Int 21 Fn 5FB7  - LANtastic V4.1+ - Get Auto-login Defaults                [N]

   AX = 5FB7h
   ES:DI -> pointer to 16-byte buffer to store ASCIZ auto-login user name

Return: CF clear if successful
       DL = adapter number used for default login attempt
       FFh all valid adapters will be tried
       00h-05h specified adapter will be tried explicitly
   CF set on error
       AX = error code

See Also: AX=5F81h,AX=5FB6h