http://support.appgate.com/mindterm/demo/index.php
When running from a browser, java requires security clearance to access your hard drive (required if you need MindTerm to read your private key for public key authentication) and to access an ssh server which is not also the webserver from which you ran MindTerm. Failing to create the MindTerm directories can cause some problems, but most things should still work.
When choosing the public key authentication method, you should Browse to find the private key you wish to use.