{
{    The purpose of this request is to accept delivery of a datagram.  The data
{ event to be delivered (if any) will be taken from the queue of data events
{ which have arrived at the local system.  The order in which data events are
{ delivered may not be the same as the order in which they were sent.
{
{       NAP$RECEIVE_NETWORK_DATA (SAP, DATA_AREA, WAIT_TIME, SOURCE, MULTICAST,
{             RECEIVED_DATA_LENGTH, STATUS)
{
{ SAP: (input)  This parameter specifies an open service access point over
{       which delivery is to occur.  Only a data event sent to this service
{       access point will be delivered.
{
{ DATA_AREA: (input, output)  This parameter specifies a data area to receive
{       the data contained in the data event.
{
{ WAIT_TIME: (input)  This parameter specifies the amount of time (in
{       milliseconds) that the caller is willing to wait for a datagram to be
{       delivered.  Control will not be returned to the caller until a datagram
{       is available or the wait duration expires.  If no datagram is available
{       for delivery within this amount of time, an abnormal status will be
{       returned.
{
{ SOURCE: (output)  This parameter specifies the OSI NSAP Address or the XNS
{       Internet address from which the data was sent.
{
{ MULTICAST: (output)  This parameter specifies whether or not the datagram was
{       delivered to the local system via a multicast on the underlying
{       network.  This attribute will be FALSE for events received over the OSI
{       network layer.
{
{ RECEIVED_DATA_LENGTH: (output)  This parameter specifies the length of the
{       data contained in the datagram and delivered to the specified data
{       area.
{
{ STATUS: (output) This parameter specifies the request status.
{       CONDITIONS:
{             nae$no_datagram_available
{             nae$sap_not_open
{       IDENTIFIER: 'NA'
{
