basically, you select 2 databases, they can be on 2 different servers as long as you are connected to both of them. It will then generate SQL to make one match the other (Create tables, alter tables, drop tables, etc.) It will save it to the clipboard or to a file.
Very cool feature. I use it a lot when getting ready to roll to production. I sync my development and production boxes and then use the script that it generates as part of my roll. (After reading it carefully myself)
HTH,
=C=