INT 21 - LANtastic v4.1+ - SET AUTO-LOGIN DEFAULTS                              
	AX = 5FB6h
	ES:DI -> pointer to ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. default user name, immediately followed by
		ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. 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
SeeAlso: AX=5FB7h