Testing User permissions, 10.1 vs 7.5

Hi:

In 7.5 we could test any users permissions by going to "connection wizard" and then selecting the option "use a different user ID and password". I can't seem to find that option or functionality in 10.1. We are doing an upgrade and want to evaluate the security we've set up due to the sensitive nature of some of the information.

Can anyone tell me how I can do this in 10.1?

thanks

Shawn