{
{   The purpose of this procedure is to determine if a volume is in the active
{ set table.  The volume may be either a member volume or a master volume.  If
{ the  volume  is found the active set table index for the set that the volume
{ belongs to is returned.  The volume may be either active or inactive.
{
{       STP$SEARCH_AST_BY_VOLUME (VOLUME, AST_ENTRY, AST_INDEX, VOLUME_FOUND)
{
{ VOLUME: (input) This parameter specifies the recorded vsn of the  volume  to
{       search for.
{
{ AST_ENTRY:  (output)  If  volume_found  this parameter returns a copy of the
{       active set table entry that the volume belongs to.
{
{ AST_INDEX: (output) If volume_found this parameter returns  the  active  set
{       table index to the set that the volume belongs to.
{
{ VOLUME_FOUND:  (output)  This parameter returns whether the volume was found
{       in the active set table.
{
