PROBLEM TO BE SOLVED: To avoid a deterioration in application readability and debugging difficulty which are caused because a notification from an individual computer is asynchronously transmitted to the application in a cluster computer.;SOLUTION: A "session" is used to describe states of cluster computer middleware. The "session" is a sequence of coherent processes and satisfies the following two conditions. (a) A notification is issued to an application each time the session starts or terminates. (b) Two sessions maintain any of anteroposterior relation/inclusion relation/no relation.;COPYRIGHT: (C)2009,JPO&INPIT
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