(About roseus) How can I know about member functions and keyword arguments?

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Hello,

I have a question about roseus. In a sample program, there are arguments like
(ros::roseus ... )
(ros::advertise-service ... )

But how can I get the information about the member functions (and keyword arguments) ?
Or where are these defined ?
This is the example of the sample program.

#!/usr/bin/env roseus

(ros::load-ros-manifest "roseus")
(ros::roseus "talker")
(ros::advertise "chatter" std_msgs::string 1)
(ros::rate 100)
(while (ros::ok)
  (setq msg (instance std_msgs::string :init))
  (send msg :data (format nil "hello world ~a" (send (ros::time-now) :sec-nsec)))
  (ros::ros-info "msg [~A]" (send msg :data))
  (ros::publish "chatter" msg)
  (ros::sleep)
)
(ros::roseus "shutdown")
(exit)