{
{   The purpose of this request is to create a distinctive display attribute
{ for a specified text area.  The display attribute marks text that the
{ terminal user wants to perform some operation upon.  Screen Formatting
{ chooses a display attribute that is appropriate for the terminal.  This
{ request may only be issued on a design form.
{
{       FDP$CREATE_MARK (FORM_IDENTIFIER, START_X_POSITION, START_Y_POSITION,
{         END_X_POSITION, END_Y_POSITION, STATUS)
{
{ FORM_IDENTIFIER: (input)  This parameter specifies the form identifier.
{
{ START_X_POSITION: (input)  This parameter specifies the form x position to
{       start the mark.  The first character of a line is numbered 1.  Each
{       character position in the line going from left to right increments the
{       x position by 1.
{
{ START_Y_POSITION: (input)  This parameter specifies the form y position to
{       start the mark.  The top most line of the form is numbered 1.  Each
{       line going from top to bottom of the form line increments the y
{       position by 1.
{
{ END_X_POSITION: (input)  This parameter specifies the end x position to
{       mark.  The starting and ending positions may be the same.
{
{ END_Y_POSITION: (input)  This parameter specifies the end y position to
{       mark.  The starting and ending positions may be the same.
{
{ STATUS: (output) This parameter specifies the name of the variable to set to
{       indicate the status of the request.
{
{       condition identifiers: fde$area_cuts_object
{                              fde$bad_data_value
{                              fde$create_mark_invalid
{                              fde$form_not_scheduled
{                              fde$form_pushed
{                              fde$invalid_form_identifier
{                              fde$mark_outside_form
{                              fde$no_space_available
{                              fde$system_error
{
