{
{   The purpose of this request is to add a form to the list of forms
{ scheduled for display on the screen.  The next request that updates the
{ screen, fdp$read_forms or fdp$show_forms, replots the screen for the
{ terminal user.  The form lies on top of other forms occupying the same area
{ on the screen.  You cannot add a pushed form.
{
{       FDP$ADD_FORM (FORM_IDENTIFIER, STATUS)
{
{ FORM_IDENTIFIER: (input)  This parameter specifies the form to add to the
{       list of forms scheduled for display.
{
{ STATUS: (output)  This parameter specifies the name of the variable to set
{       to indicate the status of request.
{
{       condition identifiers:  fde$bad_data_value
{                               fde$form_already_added
{                               fde$form_pushed
{                               fde$form_too_large_for_screen
{                               fde$invalid_form_identifier
{                               fde$no_space_available
{                               fde$system_error
{
