{
{   The purpose  of  this  request  is  to  do all that is necessary to get an
{ unused entry in the active set table.  This includes initially creating  the
{ table, expanding the table if needed, and searching for an unused entry.
{
{       STP$GET_UNUSED_ENTRY_IN_AST (AST_INDEX, STATUS)
{
{ AST_INDEX:  (output)  This  parameter  returns the index into the active set
{       table for the unused entry.
{
{ STATUS: (output) This parameter returns the request status.
{
{       CONDITIONS: ose$mainframe_pageable_full
{
{       IDENTIFIER: stc$set_management_id
{
