{
{  This procedure changes the user's link attributes in order to
{  use dual state commands.
{
{         RHP$CHANGE_LINK_ATTRIBUTES (PARAMETER_LIST, STATUS);
{
{  PARAMETER_LIST: (input) This parameter is the list of parameters for the
{      command CHANGE_LINK_ATTRIBUTES that was entered by a user.
{
{  STATUS: (output) This parameter specifies the request status.
{      Conditions: cle$wrong_kind_of_value
{                  cle$string_too_long
{
