{
{       The purpose of this routine is to change the state of Network Access
{ Devices or their trunk connections in the currently active RHFAM
{ configuration to ON, OFF or DOWN. This process is valid only when the
{ RHFAM system task is active. The state change is not preserved when the
{ system task is deactivated. This routine will not attempt to change the
{ state of a NAD or trunk connection that is DOWN as that particular element
{ is under control of maintenance software.
{
{ RFP$CHANGE_NAD_OR_TRUNK_STATE (NAD_NAMES_P, TRUNK_NAMES_P, STATE, STATUS)
{
{ NAD_NAMES_P: (input) This parameter specifies the pointer to a list of nads
{   or the keyword ALL, that are to have their state, or specified trunk
{   connections state changed.
{
{ TRUNK_NAMES_P: (input) This parameter specifies the pointer to a list
{   of trunks which are to have the state of their connections to the specified
{   nads changed. If this value is NIL, only the states of the specified
{   nads are changed.
{
{ STATE: (input) This parameter the value of the state change, either "OFF",
{   "ON", or "DOWN". The value "DOWN" is not possible if the state of a trunk
{   connection is being changed.
{
{ STATUS: (output) This status returns the result of the request. A status
{   of normal indicates that the specified state changes have been done.
{
{     CONDITIONS: rfe$down_trunk_not_changable
{                 rfe$down_nad_not_changable
{                 rfe$element_not_found
{                 rfe$system_task_not_active
{
{     IDENTIFIER: 'RF'
{
