{
{   The purpose of this routine is to close an open volume set table, and then
{ to detach it.
{
{       STP$RETURN_OPENED_VST (SFID, VST_SEGMENT_POINTER, STATUS)
{
{ SFID: (input) This parameter specifies the system file  identifier  for  the
{       volume set table device file.
{
{ VST_SEGMENT_POINTER:  (input,  output)  This parameter specifies the segment
{       pointer to the volume set table.  This pointer may no longer  be  used
{       after this request.
{
{ STATUS: (output) This parameter returns the request status.
{
{       CONDITIONS: ERRORS FROM DEVICE MANAGEMENT
{
{       IDENTIFIER: stc$set_management_id
{
