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The P-GRADE job execution mode will be demonstrated on a small Grid containing 3 clusters from Budapest and London. The first demonstration illustrates the Grid execution of a parallel meteorology application. The parallel program will be on-line monitored remotely in the Grid and locally visualized on the submitting machine. The second demonstration will use a parallel traffic simulation program developed in P-GRADE to show the usage of the P-GRADE job mode for Grid execution. The parallel program will be checkpointed and migrated to another cluster of the Grid. On-line job and execution monitoring will be demonstrated.