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The batch file will be executed by the current cmd.exe instance (or a new cmd.exe instance if, for instance, double-clicked in Explorer).
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Same as #1, only has an effect when used inside a batch/cmd file. In a batch file, without ‘call’, the parent batch file ends and control passes to the called batch file; with ‘call’ runs the child batch file, and the parent batch file continues with statements following call.
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Runs the batch file in a new cmd.exe instance.
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Start will run the batch file in a new cmd.exe instance in a new window, and the caller will not wait for completion.