code: def open_default_resource_manager(library):
      
      session = ViSession()
      ret = library.viOpenDefaultRM(byref(session))
      return session.value, ret
docs: This function returns a session to the Default Resource Manager resource.
  
      Corresponds to viOpenDefaultRM function of the VISA library.
  
      :param library: the visa library wrapped by ctypes.
      :return: Unique logical identifier to a Default Resource Manager session, return value of the library call.
      :rtype: session, :class:`pyvisa.constants.StatusCode`