It is something you must be very careful with, Wayne. I believe the Arlington group had an article on this. The article on our Portland site on backups may also help you. www.rugpo.com/http://www.rugpo.com/page10p.html. (We are in process of changing web sites, so it will only be called this for a short time). But I think if you have the actual program on both computers, then you can use a thumb drive or CD or whatever to transfer your SQZ file back and forth. You will have to be careful each time, however to make sure that you back EVERYthing up on your sqz from one time to the next.