Oops -- I deleted the message mentioning the "hacker's guide" to picking locks. Actually it's a locksmithing guide, if you're thinking of the MIT document. http://www.lysator.liu.se/mit-guide/mit-guide.html http://www.telepath.com/pillar/locksmith.html Anyone who's really interested might also look for a document called "scrtlock.html" or "scrtlock.txt", by Steven Hampton, and which used to be on Stephen Hardman's page. -- Pete Peter Turnbull Dept. of Computer Science University of York