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diff --git a/ACE/ace/Active_Map_Manager.h b/ACE/ace/Active_Map_Manager.h
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+++ b/ACE/ace/Active_Map_Manager.h
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+/* -*- C++ -*- */
+
+//=============================================================================
+/**
+ *  @file    Active_Map_Manager.h
+ *
+ *  $Id$
+ *
+ *  @author Irfan Pyarali
+ */
+//=============================================================================
+
+
+#ifndef ACE_ACTIVE_MAP_MANAGER_H
+#define ACE_ACTIVE_MAP_MANAGER_H
+#include /**/ "ace/pre.h"
+
+#include /**/ "ace/ACE_export.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/Basic_Types.h"
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+/**
+ * @class ACE_Active_Map_Manager_Key
+ *
+ * @brief Key used in the Active Object Map.
+ *
+ * This key keeps information of the index and the generation
+ * count of the slot it represents.  Since the index information
+ * is part of the key, lookups are super fast and predictable,
+ */
+class ACE_Export ACE_Active_Map_Manager_Key
+{
+public:
+  /// Default constructor.
+  ACE_Active_Map_Manager_Key (void);
+
+  /**
+   * Constructor given the @a slot_index and @a slot_generation number.
+   * This is useful once the user has somehow recovered the
+   * @a slot_index and @a slot_generation number from the client.
+   */
+  ACE_Active_Map_Manager_Key (ACE_UINT32 slot_index,
+                              ACE_UINT32 slot_generation);
+
+  /// Get the <slot_index>.
+  ACE_UINT32 slot_index (void) const;
+
+  /// Set the <slot_index>.
+  void slot_index (ACE_UINT32 i);
+
+  /// Get the <slot_generation> number.
+  ACE_UINT32 slot_generation (void) const;
+
+  /// Set the <slot_generation> number.
+  void slot_generation (ACE_UINT32 g);
+
+  /// Size required to store information about active key.
+  static size_t size (void);
+
+  /// Recover state of active key from @a data.  User must make sure
+  /// that @a data encoded using the encode() method.
+  void decode (const void *data);
+
+  /// Encode state of the active key into @a data.  @a data must be as
+  /// big as the value returned from <size>.
+  void encode (void *data) const;
+
+  /// Compare keys.
+  bool operator== (const ACE_Active_Map_Manager_Key &rhs) const;
+  bool operator!= (const ACE_Active_Map_Manager_Key &rhs) const;
+
+  // = This really should be protected but because of template
+  // friends, they are not.
+
+  /// Increment the <slot_generation> number.
+  void increment_slot_generation_count (void);
+
+private:
+
+  /**
+   * @brief Data for the Active Object Map Key.
+   *
+   * This separate structure makes it easier to manage copying
+   *  the index and the generation to and from the user buffer.
+   *
+   */
+  struct key_data
+  {
+    /// Slot index in the active map.
+    ACE_UINT32 slot_index_;
+
+    /// Slot generation number of <slot_index_> slot in the active map.
+    ACE_UINT32 slot_generation_;
+  };
+
+  /// Data for the Active Object Map Key.
+  key_data key_data_;
+};
+
+ACE_END_VERSIONED_NAMESPACE_DECL
+
+#if defined (__ACE_INLINE__)
+#include "ace/Active_Map_Manager.inl"
+#endif /* __ACE_INLINE__ */
+
+// Include the templates here.
+#include "ace/Active_Map_Manager_T.h"
+
+#include /**/ "ace/post.h"
+#endif /* ACE_ACTIVE_MAP_MANAGER_H */