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diff --git a/src/backend.h b/src/backend.h
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+/*
+ * Copyright 2013 Canonical Ltd.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __INDICATOR_SESSION_BACKEND_H__
+#define __INDICATOR_SESSION_BACKEND_H__
+
+#include <gio/gio.h> /* GCancellable */
+
+#include "actions.h"
+#include "guest.h"
+#include "users.h"
+
+G_BEGIN_DECLS
+
+/**
+ * Gets instances of the backend abstract base classes.
+ * These are how IndicatorSystemService knows what's happening on the system.
+ *
+ * This function isn't defined in libindicatorsessionservice.
+ * Instead, one of two implementations is statically linked at build time:
+ * one for production in libbackenddbus (in src/backend-dbus/) or
+ * one for testing in libbackendmock (in tests/).
+ */
+void backend_get (GCancellable             * cancellable,
+                  IndicatorSessionActions ** setme_actions,
+                  IndicatorSessionUsers   ** setme_users,
+                  IndicatorSessionGuest   ** setme_guest);
+
+G_END_DECLS
+
+#endif