{
{   The purpose of this request is to update the user's terminal screen, if
{ necessary, and accept input from the terminal user.  Any events which the
{ program has not retrieved with the fdp$xget_next_event request are deleted
{ before accepting input from the terminal user.
{
{       FDP$XREAD_FORMS (STATUS)
{
{ STATUS: (output) This parameter specifies the variable to set
{       to indicate the results of the request.
{
{       condition identifiers: fde$bad_data_value
{                              fde$no_events_active
{                              fde$no_forms_to_read
{                              fde$system_errors
{                              fde$terminal_disconnected
{
