code: def help(self, *args):
          
          if len(args) == 0:
              return help_msg
  
          which = args[0].lower()
  
          if which == 'ginga':
              method = args[1]
              _method = getattr(self.fv, method)
              return _method.__doc__
  
          elif which == 'channel':
              chname = args[1]
              method = args[2]
              chinfo = self.fv.get_channel(chname)
              _method = getattr(chinfo.viewer, method)
              return _method.__doc__
  
          else:
              return ("Please use 'help ginga <method>' or "
                      "'help channel <chname> <method>'")
docs: Get help for a remote interface method.
  
          Examples
          --------
          help('ginga', `method`)
              name of the method for which you want help
  
          help('channel', `chname`, `method`)
              name of the method in the channel for which you want help
  
          Returns
          -------
          help : string
              a help message