{
{      The purpose of this request is to locate a specified active volume
{ table entry.  The specification of the desired active volume table
{ entry is done using a search key.
{
{      DMP$SEARCH_ACTIVE_VOLUME_TABLE (SEARCH_KEY,AVT_INDEX,
{                                   ACTIVE_VOLUME_ENTRY_NOT_FOUND)
{
{ SEARCH_KEY:(input)  This parameter specifies the search criteria to be
{      used in locating the active volume table entry.  Current search
{      keys are: recorded vsn and logical unit number.
{
{ AVT_INDEX:(output)  This paraeter is used to return an index to the
{      active volume table entry if the search is successful.  IF the
{      search is not successful, the index of an available active volume
{      table entry is returned.
{
{ ACTIVE_VOLUME_ENTRY_NOT_FOUND:(output)  This parameter is used to
{      return the result of the request.
{
