{   The purpose of this request is to update the terminal screen.
{
{       FDP$UPDATE_SCREEN (STATUS)
{
{ STATUS: (output)  This parameter specifies the name of the variable to set
{       to indicate the status of request.
{
{       condition identifiers:  fde$system_error
{                               fde$terminal_disconnected
{                               fde$terminal_not_identified
{
{
