{
{     The purpose of this procedure is to return a set of the operator classes
{ currently active in the SYSTEM OPERATOR UTILITY.
{
{       OFP$GET_ACTIVE_OPERATOR_CLASSES (ACTIVE_OPERATOR_CLASSES)
{
{ ACTIVE_OPERATOR_CLASSES: (output) This parameter specifies the set of active
{       operator classes under the SYSTEM OPERATOR UTILITY.
{
