{
{   The purpose of this request is to send data over an open connection.  This
{ request will cause delivery of a "data" event to the user at to other end of
{ the connection.
{
{ ENTRY REQUIREMENTS: The application layer is responsible for ensuring
{                     adequate outbound capacity, interface flow control,
{                     exists on the connection to hold all "data" (See:
{                     nlp$xns_get_outbound_capacity). Otherwise, there is
{                     the potential for a catastrophicsystem error.
{
{       NLP$SL_DATA_REQUEST (XNS_CONNECTION, QUALIFIED_DATA,
{         END_OF_MESSAGE, DATA, STATUS)
{
{ XNS_CONNECTION: (input) This parameter specifies the XNS connection on which
{       data is to be sent.
{
{ QUALIFIED_DATA: (input) This parameter specifies whether the DATA parameter
{      contains qualified data.  The significance of qualified data must be
{      agreed upon by the communicating users.
{
{ END_OF_MESSAGE: (input) This parameter specifies the end of the message
{      boundary.
{
{ DATA: (input) This parameter specifies data to be included as part of the
{      "data" event.
{
{ STATUS: (output) This parameter specifies the request status.
{       CONDITIONS: nae$connection_not_open, nae$protocol_error,
{                   nae$invalid_request
{       IDENTIFIER: 'NA'
{
