reBlog and Cron Job

Someone mentioned on Sourceforge the possiblity of extending the reBlog.php (http://www.reblog.org) plugin to be able to run as a stand alone file (or with HTTP auth). I looked at the reBlog.php file and was lost. Not sure how I can call globals without a user authentication. Any idea on how to hack this to run without a user login?

http://sourceforge.net/forum/forum.php?thread_id=1223777&forum_id=363574

http://reblog.org