+// these functions can be used to hook into wxApp event processing and are
+// currently used by the events propagation test
+class WXDLLIMPEXP_FWD_BASE wxEvent;
+
+typedef int (*FilterEventFunc)(wxEvent&);
+typedef bool (*ProcessEventFunc)(wxEvent&);
+
+extern void SetFilterEventFunc(FilterEventFunc func);
+extern void SetProcessEventFunc(ProcessEventFunc func);
+
+extern bool IsNetworkAvailable();