def grab_server(self, onerror = None):
        """Disable processing of requests on all other client connections
        until the server is ungrabbed. Server grabbing should be avoided
        as much as possible."""
        request.GrabServer(display = self.display,
                           onerror = onerror)
Disable processing of requests on all other client connections
        until the server is ungrabbed. Server grabbing should be avoided
        as much as possible.