* library. On each change / activity, re-draw the windows with draw_all_wins().
* When the loop ends regularly (due to the user sending a quit command), return
* an appropriate quit message to write to stdout when the client winds down.
* library. On each change / activity, re-draw the windows with draw_all_wins().
* When the loop ends regularly (due to the user sending a quit command), return
* an appropriate quit message to write to stdout when the client winds down.