diff --git a/lib/rpc_table.py b/lib/rpc_table.py
index 599e7d8..1d3752d 100644
--- a/lib/rpc_table.py
+++ b/lib/rpc_table.py
@@ -49,6 +49,7 @@ func_table = [
     [ "objlist", ["int"] ],
     [ "objlist", ["int", "int"] ],
     [ "objlist", ["int", "int", "int"] ],
+    [ "objlist", ["int", "string"] ],
     [ "objlist", ["string"] ],        
     [ "objlist", ["string", "int"] ],
     [ "objlist", ["string", "int", "int"] ],
diff --git a/net/common/rpc-service.c b/net/common/rpc-service.c
index 92f6473..a30132a 100644
--- a/net/common/rpc-service.c
+++ b/net/common/rpc-service.c
@@ -264,6 +264,10 @@ ccnet_start_rpc(CcnetSession *session)
                                      ccnet_rpc_get_group_members,
                                      "get_group_members",
                                      searpc_signature_objlist__int());
+    searpc_server_register_function ("ccnet-threaded-rpcserver",
+                                     ccnet_rpc_get_members_with_prefix,
+                                     "get_members_with_prefix",
+                                     searpc_signature_objlist__int_string());
     searpc_server_register_function ("ccnet-threaded-rpcserver",
                                      ccnet_rpc_check_group_staff,
                                      "check_group_staff",
@@ -292,6 +296,10 @@ ccnet_start_rpc(CcnetSession *session)
                                      ccnet_rpc_get_child_groups,
                                      "get_child_groups",
                                      searpc_signature_objlist__int());
+    searpc_server_register_function ("ccnet-threaded-rpcserver",
+                                     ccnet_rpc_get_descendants_groups,
+                                     "get_descendants_groups",
+                                     searpc_signature_objlist__int());
 
     searpc_server_register_function ("ccnet-threaded-rpcserver",
                                      ccnet_rpc_create_org,
@@ -847,6 +855,18 @@ ccnet_rpc_get_child_groups (int group_id, GError **error)
     return groups;
 }
 
+GList*
+ccnet_rpc_get_descendants_groups(int group_id, GError **error)
+{
+    CcnetGroupManager *group_mgr =
+        ((CcnetServerSession *)session)->group_mgr;
+    GList *groups = NULL;
+
+    groups = ccnet_group_manager_get_descendants_groups (group_mgr, group_id, error);
+
+    return groups;
+}
+
 GList*
 ccnet_rpc_search_ldapusers (const char *keyword,
                             int start, int limit,
@@ -1218,6 +1238,18 @@ ccnet_rpc_get_group_members (int group_id, GError **error)
     return g_list_reverse (ret);
 }
 
+GList *
+ccnet_rpc_get_members_with_prefix(int group_id, const char *prefix, GError **error)
+{
+    CcnetGroupManager *group_mgr =
+        ((CcnetServerSession *)session)->group_mgr;
+    GList *ret = NULL;
+
+    ret = ccnet_group_manager_get_members_with_prefix (group_mgr, group_id, prefix, error);
+
+    return ret;
+}
+
 int
 ccnet_rpc_check_group_staff (int group_id, const char *user_name,
                              GError **error)
diff --git a/net/common/rpc-service.h b/net/common/rpc-service.h
index 9c2ba24..e18fbc1 100644
--- a/net/common/rpc-service.h
+++ b/net/common/rpc-service.h
@@ -227,12 +227,18 @@ ccnet_rpc_get_top_groups (GError **error);
 GList *
 ccnet_rpc_get_child_groups (int group_id, GError **error);
 
+GList *
+ccnet_rpc_get_descendants_groups(int group_id, GError **error);
+
 GObject *
 ccnet_rpc_get_group (int group_id, GError **error);
 
 GList *
 ccnet_rpc_get_group_members (int group_id, GError **error);
 
+GList *
+ccnet_rpc_get_members_with_prefix(int group_id, const char *prefix, GError **error);
+
 int
 ccnet_rpc_check_group_staff (int group_id, const char *user_name,
                              GError **error);
diff --git a/net/server/group-mgr.c b/net/server/group-mgr.c
index e2f4692..81fbd13 100644
--- a/net/server/group-mgr.c
+++ b/net/server/group-mgr.c
@@ -864,6 +864,33 @@ ccnet_group_manager_get_child_groups (CcnetGroupManager *mgr, int group_id,
     return ret;
 }
 
+GList *
+ccnet_group_manager_get_descendants_groups(CcnetGroupManager *mgr, int group_id,
+                                           GError **error)
+{
+    GList *ret = NULL;
+    CcnetDB *db = mgr->priv->db;
+    const char *table_name = mgr->priv->table_name;
+
+    GString *sql = g_string_new("");
+    g_string_printf (sql, "SELECT g.group_id, group_name, creator_name, timestamp, "
+                          "parent_group_id FROM `%s` g, GroupStructure s "
+                          "WHERE g.group_id=s.group_id "
+                          "AND (s.path LIKE '%d, %%' OR s.path LIKE '%%, %d, %%' "
+                          "OR g.group_id=?)",
+                          table_name, group_id, group_id);
+
+    if (ccnet_db_statement_foreach_row (db, sql->str,
+                                        get_user_groups_cb, &ret,
+                                        1, "int", group_id) < 0) {
+        g_string_free (sql, TRUE);
+        return NULL;
+    }
+    g_string_free (sql, TRUE);
+
+    return ret;
+}
+
 CcnetGroup *
 ccnet_group_manager_get_group (CcnetGroupManager *mgr, int group_id,
                                GError **error)
@@ -933,6 +960,47 @@ ccnet_group_manager_get_group_members (CcnetGroupManager *mgr, int group_id,
     return g_list_reverse (group_users);
 }
 
+GList *
+ccnet_group_manager_get_members_with_prefix (CcnetGroupManager *mgr,
+                                             int group_id,
+                                             const char *prefix,
+                                             GError **error)
+{
+    CcnetDB *db = mgr->priv->db;
+    GList *group_users = NULL;
+    GList *ptr;
+    CcnetGroup *group;
+    GString *sql = g_string_new ("");
+    int id;
+
+    g_string_printf(sql, "SELECT group_id, user_name, is_staff FROM GroupUser "
+                         "WHERE group_id IN (");
+    GList *groups = ccnet_group_manager_get_descendants_groups(mgr, group_id, NULL);
+    if (!groups)
+        g_string_append_printf(sql, "%d", group_id);
+
+    for (ptr = groups; ptr; ptr = ptr->next) {
+        group = ptr->data;
+        g_object_get(group, "id", &id, NULL);
+        g_string_append_printf(sql, "%d", id);
+        if (ptr->next)
+            g_string_append_printf(sql, ", ");
+    }
+    g_string_append_printf(sql, ")");
+    if (prefix)
+        g_string_append_printf(sql, " AND user_name LIKE '%s%%'", prefix);
+    g_list_free_full (groups, g_object_unref);
+
+    if (ccnet_db_statement_foreach_row (db, sql->str,
+                                        get_ccnet_groupuser_cb, &group_users, 0) < 0) {
+        g_string_free(sql, TRUE);
+        return NULL;
+    }
+    g_string_free(sql, TRUE);
+
+    return group_users;
+}
+
 int
 ccnet_group_manager_check_group_staff (CcnetGroupManager *mgr,
                                        int group_id,
diff --git a/net/server/group-mgr.h b/net/server/group-mgr.h
index 45c7997..c47cbef 100644
--- a/net/server/group-mgr.h
+++ b/net/server/group-mgr.h
@@ -88,6 +88,12 @@ GList *
 ccnet_group_manager_get_group_members (CcnetGroupManager *mgr, int group_id,
                                        GError **error);
 
+GList *
+ccnet_group_manager_get_members_with_prefix (CcnetGroupManager *mgr,
+                                             int group_id,
+                                             const char *prefix,
+                                             GError **error);
+
 int
 ccnet_group_manager_check_group_staff (CcnetGroupManager *mgr,
                                        int group_id,
@@ -123,6 +129,10 @@ GList *
 ccnet_group_manager_get_child_groups (CcnetGroupManager *mgr, int group_id,
                                       GError **error);
 
+GList *
+ccnet_group_manager_get_descendants_groups (CcnetGroupManager *mgr, int group_id,
+                                            GError **error);
+
 GList *
 ccnet_group_manager_get_ancestor_groups (CcnetGroupManager *mgr, int group_id);
 
diff --git a/python/ccnet/rpc.py b/python/ccnet/rpc.py
index 8a7a33f..601de87 100644
--- a/python/ccnet/rpc.py
+++ b/python/ccnet/rpc.py
@@ -315,6 +315,10 @@ class CcnetThreadedRpcClient(RpcClientBase):
     def get_child_groups(self, group_id):
         pass
 
+    @searpc_func("objlist", ["int"])
+    def get_descendants_groups(self, group_id):
+        pass
+
     @searpc_func("object", ["int"])
     def get_group(self, group_id):
         pass
@@ -323,6 +327,10 @@ class CcnetThreadedRpcClient(RpcClientBase):
     def get_group_members(self, group_id):
         pass
 
+    @searpc_func("objlist", ["int", "string"])
+    def get_members_with_prefix(self, group_id, prefix):
+        pass
+
     @searpc_func("int", ["int", "string"])
     def check_group_staff(self, group_id, username):
         pass