{
{   The purpose  of  this  request  is to translate a pointer to the permanent
{ file root into a "locator".  This  locator  does  not  include  the  segment
{ number, and cannot be dereferenced directly.
{
{       STP$BUILD_PF_ROOT_LOCATOR (P_PF_ROOT, P_VOL_SET_TABLE, PF_ROOT_LOCATOR)
{
{ P_PF_ROOT: (input) This parmeter specifies the pointer to the permanent file
{       root.  This pointer can be NIL.
{
{ P_VOL_SET_TABLE: (input) This parameter specifies the pointer to the
{       volume set table in which the root was allocated in.
{
{ PF_ROOT_LOCATOR:  (output)  This  parameter  returns  the  locator  to   the
{       permanent  file  root.   This locator can be used later to construct a
{       pointer that can be referenced (see stp$build_pf_root_pointer).
{
