{
{   The purpose of this request is to write sufficient space characters to the
{ display such that the next character of data written to the display will
{ appear in the specified column.  If data has already been written at or
{ beyond the specified column, this request is ignored.
{
{       CLP$HORIZONTAL_TAB_DISPLAY (DISPLAY_CONTROL, COLUMN_NUMBER, STATUS)
{
{ DISPLAY_CONTROL: (input, output)  This parameter specifies the
{       display_control variable initialized when the display was opened.
{
{ COLUMN_NUMBER: (input)  This parameter specifies the column to which to tab.
{
{ STATUS: (output)  This parameter specifies the request status.
{
