This is a Message Board Post that is gatewayed to this mailing list. Classification: Query Message Board URL: http://boards.ancestry.com/mbexec/msg/rw/EgC.2ACE/9931.1 Message Board Post: Have a look at http://www.electricscotland.com/webclans/dtog/davidso2.html and elsewhere on that site. The explanation should perhaps be a little clearer.