that developed into the IBM Systems Network Architecture, or SNA, basically
To discover more fascinating science content, head to bbc.co.uk, search for BBC Inside Science and follow the links to The Open University.
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Less than half way round their usual route, they run out of meals.
When the track ends—detected either via the ended event or via the stall watcher noticing the currentTime approaching durationit will collect chunks that are stitched together: