Yes, TidWiT utilizes 256-bit Secure Socket Layer (SSL) to encrypt passwords. Passwords are protected at multiple levels: the webpage level (https), the application level, and the database level.
Yes, users can reset their password in the Manage My Profile section (see above screenshot).
Yes, TidWiT provides built-in functionality that could resend the Password to the registered e-mail of the user. Here is a snip that shows it.
Yes, since instances are independent of one another, you can register and use the same username and password on different instances.
Yes, with TidWiT Exterprise, an organization can get Single Sign-On features. For more information, reference the topic Single Sign-On.