There's a great summary of how concurrency works on StackExchange:

http://drupal.stackexchange.com/questions/60565/how-to-use-drushs-concur...

See the section in the question starting at "UPDATE". It would be great to find a place to put this in the Drush documentation or handbook.

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greg.1.anderson’s picture

greg.1.anderson commented
Status: Active » Closed (won't fix)
Issue tags: +Needs migration

This issue was marked closed (won't fix) because Drush has moved to Github.

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