{
{   The purpose  of  this  procedure  is  to return information from an opened
{ volume set table.  The information that is returned on this request is  that
{ information that pertains to both master and member volume set tables.
{
{       STP$OBTAIN_VST_HEADER (P_VOL_SET_TABLE, VOLUME, INTERNAL_VSN,
{         VOLUME_IN_SET, SET_NAME, UNIQUE_SET_NAME, VOLUME_STATUS_IN_SET)
{
{ P_VOL_SET_TABLE: (input) This parameter specifies the pointer to the  volume
{       set  table  that  information is desired for.  This is assumed to be a
{       valid pointer.
{
{ VOLUME: (output) This parameter returns the name of the volume  as  recorded
{       in the volume set table.
{
{ INTERNAL_VSN: (output) This parameter returns the internal vsn of the volume
{       as recorded in the volume set table.
{
{ VOLUME_IN_SET: (output) This parameter  indicates  whether  this  volume  is
{       associated  with  a  set,  (according  to  the volume set table).  The
{       volume set table (device file)  should  have  been  destroyed  if  the
{       volume  is  not  in a set.  This can be used as a self check.  If this
{       parameter is FALSE the following fields returned are undefined.
{
{ SET_NAME: (output) This parameter returns  the  name  of  the  set  that  is
{       recorded in the volume set table.
{
{ UNIQUE_SET_NAME: (output) This parameter returns the unique set name.
{
{ VOLUME_STATUS_IN_SET:  (output) This parameter returns whether the volume is
{       a  master  volume  (stc$master_vol)  or  the   member   of   the   set
{       (stc$member_vol).
{
