Thank Gerald for sharing your knowledge. Personally, I kind feel a little strange for that, in spite of the nature of GAE app what needs to consider of multi-instances of app, GAE platform haven't provided any event hooks available what can be used across app instances, though the technical difficulty to implement such is easily anticipated. Thereby, for this, I decided to just give a shot by filing the issue: http://code.google.com/p/googleappengine/issues/detail?id=5929&can=4&colspec=ID%20Type%20Component%20Status%20Stars%20Summary%20Language%20Priority%20Owner%20Log
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