
{
{     The purpose of this request is to obtain a layer's protocol header
{  from the message header.  The message header and length are updated
{  as the result of the request.
{
{     If the protocol header length is greater than the message header
{  length, the result of the request is indeterminate.
{
{       NLP$GET_LAYER_PROTOCOL_HEADER (PROTOCOL_HEADER,
{             PROTOCOL_HEADER_LENGTH, MESSAGE_HEADER, MESSAGE_HEADER_LENGTH)
{
{  PROTOCOL_HEADER: (input) This parameter specifies the address of the
{       obtained protocol header.
{
{  PROTOCOL_HEADER_LENGTH: (input) This parameter specifies the length of
{       the protocol header.
{
{  MESSAGE_HEADER: (input, output) This parameter specifies the message
{       header address.
{
{  MESSAGE_HEADER_LENGTH: (input, output) This parameter specifies the length
{       of the message header.
{

