{HEAD ~ a notification message receiver mechanism} configured to receive {TAIL ~ a notification message} sent from said notification mechanism; said notification message providing notice that an information file sufficiently changed; said notification message initiated by one who maintains said information file; and 
configured to receive
{ HEAD ~ a notification message receiver mechanism } configured to receive { TAIL ~ a notification message } sent from said notification mechanism ; said notification message providing notice that an information file sufficiently changed ; said notification message initiated by one who maintains said information file ; and
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