Use these sockets for standard input/output/error. There must be an [[#OverrideService]] key present for either <code>bsd:u</code> or <code>bsd:s</code>, depending on which is indicated.
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* '''Key:''' 9
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* '''IsRecognitionMandatory:''' False.
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* '''IsPresenceMandatory:''' False.
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* '''Value[0]:''' First word: stdout file descriptor, second word: stdin file descriptor
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* '''Value[1]:''' Third word: stderr file descriptor, fourth word: SocketService