?? LEFT := 1, RIGHT := 110 ??

{
{   The purpose of this request is to send an error message (XNS Error Packet) to a
{ specified address in response to an offending datagram.  The XNS Internet layer will
{ attempt to deliver the message to the destination, but reliable delivery is not
{ guaranteed.  A fabricated  XNS Internet PDU header is prefixed to the specified data
{ to complete the image of an offending datagram.
{
{   This request is provided for direct users of the XNS Internet layer.
{
{       NLP$XE_SEND_ERROR_MESSAGE (SOURCE_SAP, DESTINATION, USER_PROTOCOL,
{         ERROR_NUMBER, ERROR_PARAMETER, OFFENDING_DATA, STATUS)
{
{ SOURCE_SAP: (input) This parameter specifies an open service access point sap
{       which the error message is to be sent.
{
{ DESTINATION: (input) This parameter specifies the XNS Internet address to which
{       the error message is to be sent.
{
{ USER_PROTOCOL: (input) This parameter specifies the user protocol value to be
{       placed in the fabricated XNS Internet header used to complete the XNS Error
{       Packet.  Nominally, this value is the user protocol from the offending
{       datagram which caused the error message to sent.
{
{ ERROR_NUMBER: (input) This parameter specifies the error number to placed in
{       error message.
{
{ ERROR_PARAMETER: (input) This parameter specifies the error parameter to be placed
{       in the error message.
{
{ OFFENDING_DATA: (input) This parameter specifies the offending data.  Upto 1440
{       bytes of data can be sent.  If the data specifed exceeds 1440 bytes, only the
{       first 1440 bytes will be transmitted.  Enough data should provided so that
{       the peer entity can return an appropriate response to its user (e.g., XNS
{       Transport provides 12 bytes -- the sequenced packet header).
{
{ STATUS: (output) This parameter specifies the request status.
{       CONDITIONS: nae$sap_not_open.
{       IDENTIFIER: 'NA'
{
