All, One of my post-docs dropped this URL into my inbox. http://interactive.linuxjournal.com/article/7922 It's quite old, but I don't remember seeing it discussed here previously and I can't find mention of it in the archives. Later, Andy ------------- Yada, yada, yada... The information contained in this e-mail (including any attachments) is confidential and is intended for the use of the addressee only. The opinions expressed within this e-mail (including any attachments) are the opinions of the sender and do not necessarily constitute those of Roslin Institute (Edinburgh) ("the Institute") unless specifically stated by a sender who is duly authorised to do so on behalf of the Institute.