{
{    The purpose of this procedure is to open the specified network sap.  The
{ open sap request is rejected if the specified sap is already open.  The open
{ network sap request is sent to the Network Access Provider in all the
{ directly connected communications devices that support the OSI protocol stack.
{ The process of opening the network sap in the communications device results
{ in establishing a channel connection between the Network Access Agent in the
{ host and the Network Access provider in the device.  This channel connection
{ represents the service access point to the OSI Connection Less Mode Network
{ layer.  All subsequent communication over the sap occurs over the channel
{ connection.  When the communications device becomes unavailable, the channel
{ connection is disconnected and no communication can occur over the sap.
{
{       NLP$NA_OPEN_SAP (PRIORITY, EVENT_PROCESSOR, SAP_ID, STATUS)
{
{ PRIORITY: (input)  This parameter specifies the network layer priority to be
{       associated with the data transferred over this sap.
{
{ EVENT_PROCESSOR: (input)  This parameter identifies the event processor to be
{       used to deliver the network events.
{
{ SAP_ID: (input)  This parameter specifies the identifier of the network layer
{       sap to be opened.
{
{ STATUS: (output) This parameter specifies the request status.
{       CONDITIONS:
{             nae$allocation_failed
{             nae$na_sap_aready_open
{       IDENTIFIER: 'NA'
{
