Command Server or Launcher
The Integration Flow Designer manages collections of maps at design time while a Command Server or Launcher manages the execution of maps at run time. The Integration Flow Designer treats a map as an indivisible unit at design time while a Command Server or Launcher treats maps as indivisible units at run time.
The Command Server manages the execution of one system at a time. The Launcher manages the execution of as many systems as you have defined concurrently.