INT 6F - 10NET v5.0 - LOGIN
        AH = 80h
        DS:DX -> login record (see below)
Return: CF clear if successful
            BL = number of days until password expires (00h = never)
            CL = security level
        CF set on error
            AX = status (see AH=00h)
SeeAlso: AH=00h,AH=81h

Format of login record:
Offset  Size    Description
 00h  8 BYTEs   user name
 08h  8 BYTEs   password
 10h 15 BYTEs   server node ID
 1Fh  8 BYTEs   new password
 27h    BYTE    invoke mode (00h command line, 01h interactive)

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