def METHOD_NAME(self, args):
    '''control behaviour of the OSD module'''
    if len(args) == 0:
        print(self.usage())
    elif args[0] == "param-set":
        self.param_set(args[1:])
    elif args[0] == "param-show":
        self.param_show(args[1:])
    else:
        print(self.usage())