{
{ Procedure DUP$CLOSE_DISPLAY is the central interface for closing DEBUG output
{ files.
{
{ DUP$CLOSE_DISPLAY (VAR display_control_pointer: ^clt$display_control; close_
{      default_file: boolean; VAR status)
{
{ display_control_pointer - points to the display control block describing
{      the file which the user would like closed
{
{ close_default_file - this specifies an override (when true) that prevents the
{      default output file from ever being closed
{
{ status - standard status variable
{
