<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _pipe(self):
 """On Windows we use a pipe to emulate a Linux style character buffer."""

        if self._evdev:
            return None

        if not self.__pipe:
            target_function = self._get_target_function()
            if not target_function:
                return None

            self.__pipe, child_conn = Pipe(duplex=False)
            self._listener = Process(target=target_function,
                                     args=(child_conn,), daemon=True)
            self._listener.start()
        return self.__pipe