Mantis#2105. Thank you kindly, HomerHorwitz for a patch that addresses:

Due to the many problems with not cleaned up child-agents, I thought it 
might make sense to be able to see them on the console. 'show users' on 
the region-server's console now outputs root- and child-agents (with 
"root" or "child" column)

OpenSim/Region/Environment/Scenes/SceneManager.cs

@@ -435,6 +435,19 @@ namespace OpenSim.Region.Environment.Scenes
             return avatars;
         }
 
+        public List<ScenePresence> GetCurrentScenePresences()
+        {
+            List<ScenePresence> presences = new List<ScenePresence>();
+
+            ForEachCurrentScene(delegate(Scene scene)
+            {
+                List<ScenePresence> scenePresences = scene.GetScenePresences();
+                presences.AddRange(scenePresences);
+            });
+
+            return presences;
+        }
+
         public RegionInfo GetRegionInfo(ulong regionHandle)
         {
             foreach (Scene scene in m_localScenes)