{
{    The purpose of this request is to accept delivery of a channelnet
{ datagram.  The datagram to be delivered (if any) will be taken from the queue
{ of datagrams which have arrived at the local system.  The order in which
{ datagrams are delivered may not be the same as the order in which they were
{ sent.
{
{       NAP$CN_RECEIVE_DATAGRAM (SAP, DATA_AREA, WAIT_TIME, DEVICE, SOURCE,
{             RECEIVED_DATA_LENGTH, STATUS)
{
{ SAP: (input)  This parameter specifies an open service access point over
{       which delivery is to occur.  Only a datagram sent to this service
{       access point will be delivered.
{
{ DATA_AREA: (input)  This parameter specifies a data area to receive the data
{       contained in the datagram.
{
{ WAIT_TIME: (input)  This parameter specifies the amount of time (in
{       milliseconds) that the caller is willing to wait for a datagram to be
{       delivered.  Control will not be returned to the caller until a datagram
{       is available or the wait duration expires.  If no datagram is available
{       for delivery within this amount of time, an abnormal status will be
{       returned.
{
{ DEVICE: (output)  This parameter specifies the network device over which the
{       datagram arrived.
{
{ SOURCE: (output)  This parameter specifies the source system address.  It
{       identifies the channelnet over which the datagram was received and the
{       address of the sending system on that channelnet.
{
{ RECEIVED_DATA_LENGTH: (output)  This parameter specifies the length of the
{       data contained in the datagram and delivered to the specified data
{       area.
{
{ STATUS: (output) This parameter specifies the request status.
{       CONDITIONS:
{             nae$layer_access_not_authorized
{             nae$sap_not_open
{             nae$data_area_too_small
{             nae$no_datagram_available
{       IDENTIFIER: 'NA'
{
