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-- from the largest numeric prefix found, obtain a manifest
-- load all files (which must start with a numeric prefix) from the manifest)
-- from the numeric prefix in file 'head', obtain a manifest
-- load all files (which must start with a numeric prefix) from the manifest
-- if a game encounters an error:
-- find the previous version of the definition in the 'head' numeric prefix
-- decrement 'head'
-- if a game encounters a run-time error, send it to the driver and await
-- further instructions. The app will go unresponsive in the meantime, that
-- is expected. To shut it down cleanly, type C-q in the driver.