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INT 6F - 10-NET - LOGIN
        AH = 00h
        DS:DX -> login record (see below)
Return: CL = security level
        AX = status
            0000h successful
            01FFh time out on response
            02FFh network (hardware) error
            03FFh invalid password
            04FFh local rexource not available
            05FFh server resource not available
            06FFh already logged in under different name
            07FFh login security failure (node)
            08FFh not logged in
            09FFh position calc error
            0AFFh receive subfunction not = send subfunction (i.e. read, write)
            0BFFh request function not in range
            0CFFh no more server file handle entries left
            0DFFh no more shared file table entries left
            0EFFh no more user file handle entries left
            0FFFh chat permit not on
            10FFh not a server on request
            11FFh no transporter board error
            12FFh time out on send
            13FFh item not found (spool item not on queue)
            14FFh dos access incompatible
            15FFh record already locked
            16FFh invalid parameter
            17FFh record lock time out error
            18FFh currently spooling to named device
            19FFh dropped receive message (throttle)
            1AFFh open sharing violation
            1BFFh no more tuf entries left
            1CFFh not file owner on open
            1DFFh read security not passed
            1EFFh write security not passed
            1FFFh group security not passed
            20FFh security file failure
            21FFh activity file failure
            22FFh spool cntrl file failure
            23FFh device not mounted (spooling)
            24FFh spool file has not been terminated
            25FFh device not mounted or is not being shared
            26FFh duplicate node id
            27FFh file not found error
            28FFh no more files
            29FFh unknown internal system error
            2AFFh print queue is full or corrupted
            2BFFh invalid function
            2CFFh invalid handle
            2DFFh too many files opened
            2EFFh path not found
            2FFFh named file is active
/* I've gotten one submission which says FFxxh, and another with xxFFh */
/* I don't know which way around these should be, does somebody else know? */
            FF01h timeout
            FF02h network error
            FF03h invalid password
            FF04h no local buffer
            FF05h superstation not available
            FF06h node already logged in
            FF07h login not valid from this node
            FF08h node ID already in use
            FF16h invalid parameter (bad length, invalid node ID, etc)
            FF17h record locked by another user
            FF18h sent message has been dropped
SeeAlso: AH=01h

Format of login record:
Offset  Size    Description
 00h  8 BYTEs   user name
 08h  8 BYTEs   password
 10h 12 BYTEs   name of SuperStation