![screen shot 2013-06-25 at 23 54 54](https://f.cloud.github.com/assets/303117/706020/544eeb68-dde2-11e2-9f2a-d4f3098e2825.png)
I tested manually (see screenshot) that setting a variable with update is local to the connection.

I used the update form just because I did not want to use a stringy query.