The GROUP command is a pseudo command used to provide flow control between many other queue commands. The GROUP command is the beginning of a group of queue commands. Each GROUP command has a multiprocessing option with the same meaning as the the EXEC command. The GROUP command is thread-based on the name assigned the GROUP in the first line. The first line also defines the expiration time of the GROUP of commands. Each subsequent line in the GROUP defines a command to be run and the flow control options are for that command. There is a set of options for when the current command completes successfully and another set of options for when it fails. The options include, how many times to execute the current command, and what command to do next. The end of the GROUP is signalled with an ENDGROUP flag.