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spawn/overlayconstant
spawn/waitconstant
spawn/nowaitconstant
spawn/nowaitoconstant
spawn/detachconstant

These variables contains special flags that specify the exact semantics of process-spawn:

  • spawn/overlay replaces the current process with the new one.
  • spawn/wait suspends execution of the current process until the spawned process returns.
  • spawn/nowait does the opposite (spawn/nowaito is identical, according to the Microsoft documentation) and runs the process asynchronously.
  • spawn/detach runs the new process in the background, without being attached to a console.