
{
{     The purpose of this request is to retrieve received messages from either
{  the execution control block received message list or the system input task
{  received message list.  The XCB list is the normal residence for received
{  messages destined for any task other than the system input task. Messages
{  destined for the system input task are always queued on the system input
{  received message list.
{
{       NAP$GET_RECEIVED_MESSAGES (XCB_LIST, RECEIVED_MESSAGES)
{
{  XCB_LIST: (input) This parameter specifies whether to retrieve messages
{       from the XCB list or the system input task list.
{
{  RECEIVED_MESSAGES: (output) This parameter specified the received messages.
{
