{
{    The purpose of this procedure is to obtain the first operator action
{  menu descriptor in the list of menus which the caller is validated to
{  display. The menu list is searched from the beginning until a descriptor
{  is found whose operator_class attribute field is a subset of the input
{  parameter active_operator_classes.
{
{       OFP$GET_FIRST_OPERATOR_MENU_R1 (ACTIVE_OPERATOR_CLASSES,
{             MENU_DESCRIPTOR, STATUS)
{
{ ACTIVE_OPERATOR_CLASSES: (input) This parameter specifies the set of operator
{       classes in which the caller is active.
{
{ MENU_DESCRIPTOR: (output) This parameter specifies the descriptor of the
{       first menu in the list of menus which the caller is validated to
{       display.
{
{ STATUS: (output) This parameter specifies the status of the request.
{
{       CONDITION: ofe$no_menus_available
{
