I believe, from other posts, that you want to use the terminal emulator to enable you to log in to your colleges mainframe. Have you enquired of your college if you are allowed to access the system remotely. If you are maybe they have the required software for you to use. Most places with remote access require at least some of security software which they would supply to legitimate users.
The problem I have is that people can explain things quickly but I can only comprehend slowly.