normally waits for the child process to finish, but there are exceptions.
- If you do system "... &" on unix, system will return without waiting for the child process to finish.
- If you do system -1, ... on Windows, system will return without waiting for the child process to finish.
- Some application launch another application and exit immediately (like the Windows command start), so system would return immediately too.
- Running a windowed (as opposed to console) application in Windows will also cause system to return immediately (IIRC).
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