docs: def _npcap_set(self, key, val):
          """Internal function. Set a [key] parameter to [value]"""
          res, code = _exec_cmd(_encapsulate_admin(
              " ".join([_WlanHelper, self.guid[1:-1], key, val])
          ))
          _windows_title()  # Reset title of the window
          if code != 0:
              raise OSError(res.decode("utf8", errors="ignore"))
          return (code == 0)