{
{   The purpose of this request is to transfer a character program variable to
{ form storage.  Form storage holds the values Screen Formatting uses to
{ update the screen or to return to a program.  The form must be currently
{ open.  You cannot replace a variable from a pushed form.
{
{       FDP$XREPLACE_STRING_VARIABLE (FORM_IDENTIFIER, VARIABLE_NAME,
{         VARIABLE_OCCURRENCE, VARIABLE, VARIABLE_STATUS, STATUS)
{
{ FORM_IDENTIFIER: (input)  This parameter specifies the form identifier for
{       the instance of the form.
{
{ VARIABLE_NAME: (input)  This parameter specifies the name of the variable.
{
{ VARIABLE_OCCURRENCE: (input)  This parameter specifies the occurrence of the
{       variable name.
{
{ VARIABLE: (input)  This parameter specifies the string variable.
{
{ VARIABLE_STATUS: (output)  This parameter specifies the variable which gives
{       the status of the variable.
{
{      value:  fdc$no_error
{
{ STATUS: (output) This parameter specifies  the name of the variable to set to
{       indicate the results of the request.
{
{      condition identifiers: fde$bad_data_value
{                             fde$form_pushed
{                             fde$invalid_form_identifier
{                             fde$invalid_variable_name
{                             fde$system_error
{                             fde$unknown_occurrence
{
{
