{
{    The purpose of this request is to gain exclusive access to a connection.
{ If exclusive access cannot be acquired, (assuming the connection exists)
{ control is returned immediately to the requestor.  If the access is acquired,
{ this request must be symmetrical with a subsequent release exclusive access
{ request.
{
{    This request is internal to the Channel Connection layer and is not to be
{ called by users of the Channel Connection layer.
{
{       NLP$CC_GET_EXCLUSIVE_VIA_CID (CONNECTION_ID, SYSTEM_INPUT_TASK,
{             CONNECTION_EXISTS, ACCESS_GAINED, CONNECTION,
{             CL_CONNECTION)
{
{  CONNECTION_ID: (input)  This parameter specifies the local connection
{        identifier of the connection to be accessed.
{
{  SYSTEM_INPUT_TASK: (input)  This parameter specifies if the requesting task
{        is the system input task.  If the requesting task is the system input
{        task and exclusive access cannot be acquired, the task is notified
{        when the the connection becomes available for access.
{
{  CONNECTION_EXISTS: (output)  This parameter specifies whether the connection
{        exists.
{
{  ACCESS_GAINED: (output)  This parameter specifies whether exclusive access
{        to the connection was acquired.
{
{  CONNECTION: (output)  This parameter specifies the Channel Connection
{        description.
{
{  CL_CONNECTION: (output)  This parameter specifies the interlayer connection
{        description.
{
