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diff --git a/lib/sugar/activity/activityservice.py b/lib/sugar/activity/activityservice.py
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+++ b/lib/sugar/activity/activityservice.py
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+# Copyright (C) 2006-2007 Red Hat, Inc.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+import logging
+
+import dbus
+import dbus.service
+
+_ACTIVITY_SERVICE_NAME = "org.laptop.Activity"
+_ACTIVITY_SERVICE_PATH = "/org/laptop/Activity"
+_ACTIVITY_INTERFACE = "org.laptop.Activity"
+
+class ActivityService(dbus.service.Object):
+    """Base dbus service object that each Activity uses to export dbus methods.
+    
+    The dbus service is separate from the actual Activity object so that we can
+    tightly control what stuff passes through the dbus python bindings."""
+
+    def __init__(self, activity):
+        """Initialise the service for the given activity
+        
+        activity -- sugar.activity.activity.Activity instance
+        
+        Creates dbus services that use the instance's activity_id
+        as discriminants among all active services 
+        of this type.  That is, the services are all available 
+        as names/paths derived from the instance's activity_id.
+        
+        The various methods exposed on dbus are just forwarded
+        to the client Activity object's equally-named methods.
+        """
+        activity.realize()
+
+        activity_id = activity.get_id()
+        service_name = _ACTIVITY_SERVICE_NAME + activity_id
+        object_path  = _ACTIVITY_SERVICE_PATH + "/" + activity_id
+
+        bus = dbus.SessionBus()
+        bus_name = dbus.service.BusName(service_name, bus=bus)
+        dbus.service.Object.__init__(self, bus_name, object_path)
+
+        self._activity = activity
+
+    @dbus.service.method(_ACTIVITY_INTERFACE)
+    def SetActive(self, active):
+        logging.debug('ActivityService.set_active: %s.' % active)
+        self._activity.props.active = active
+
+    @dbus.service.method(_ACTIVITY_INTERFACE)
+    def Invite(self, buddy_key):
+        self._activity.invite(buddy_key)
+