- * If no record file exists at world.path_record, generate new world (by a
- * "seed" command calling remake_world()) in play mode, or error-exit in replay
- * mode. If a record file exists, in play mode auto-replay it up to the last
- * game state before turning over to the player; in replay mode, auto-replay it
- * up to the turn named in world.replay and then turn over to manual replay.
+ * If replay mode is called for, try for the record file and follow its commands
+ + up to the turn specified by the user, then enter manual replay. Otherwise,
+ * start into play mode after having either recreated a game world state from
+ * the savefile, or, if none exists, having created a new world with the
+ * MAKE_WORLD command. Manual replay as well as play mode take place inside
+ * io_loop().