code: def on_canvas_slave__global_command(self, slave, group, command, data):
          '''
          .. versionadded:: 0.13
  
              Execute global command (i.e., command not tied to a specific
              electrode or route).
          '''
          def command_callback(reply):
              _L().debug('%s.%s()', group, command)
              # Decode content to raise error, if necessary.
              try:
                  decode_content_data(reply)
              except Exception:
                  _L().error('Global command error.', exc_info=True)
          self.plugin.execute_async(group, command, callback=command_callbackf on_canvas_slave__global_command(self, slave, group, command, data):
          '''
          .. versionadded:: 0.13
  
              Execute global command (i.e., command not tied to a specific
              electrode or route).
          '''
          def command_callback(reply):
              _L().debug('%s.%s()', group, command)
              # Decode content to raise error, if necessary.
              try:
                  decode_content_data(reply)
              except Exception:
                  _L().error('Global command error.', exc_info=True)
          self.plugin.execute_async(group, command, callback=command_callback)
docs: .. versionadded:: 0.13
  
              Execute global command (i.e., command not tied to a specific
              electrode or route).