Popular formats are PNG, PDF, and jpeg, and they can then be presented either on the fly or directly to an X terminal, Web page, or a general graphic viewer utility.
Such account information is often precisely the same used for web-based (or even terminal) logins on a server, and can be used to take over entire systems or deface web pages.
The terminal server provides remote access to the product, which can again be used on the client with the help of a special terminal-server client or sometimes simply by a Web browser.