Why would you want to log in to a library system when you cannot physically check out or read the books/magazines in that library? It is very helpful as a preliminary search technique when you are preparing to write a paper. Also, if the University of Delaware's library does not have a book that you locate in another library, you can request that our library get the book via inter-library loan.
CAVEAT: Systems that allow public access via telnet often allow only a limited number of users at any one time. This can prove frustrating if you try to access popular sites during rush hour (e.g., during the business day at that site).
The Internet Tutorial on telnet has an illustration of using telnet to access DELCAT.