Int 21 Fn 5FB6  - Lantastic V4.1+ - Set Auto-login Defaults                [N]

   AX = 5FB6h
   ES:DI -> pointer to ASCIZ default user name, immediately followed by
       ASCIZ password
   BL = adapter number to use for default login attempt
       FFh try all valid adapters
       00h-05h try adapter 0-5 explicitly

Return: CF clear if successful
   CF set on error
       AX = error code

Notes: call with ES:DI -> two nulls to disable auto-login

See Also: AX=5FB7h