A graphical FTP-style file-sharing system. The Hotline software consists of seperate client and server programs. Hotline is similar to DirectConnect however files are only transfered between clients and the server, not client<->client.
The granddaddy of filesharing programs, predating Napster. In the days when it was popular Hotline was mainly used by people with Apple computers. Hotline was originally written by Adam Hinkley, a 16 year old Australian kid in his spare time back in the mid 90's (around 95 - 96).
HotSprings Inc. has aquired the assets of Hotline Communications Ltd. The Hotline client 1.9 has spyware in it. The client has now been open-sourced. http://www.metahot.com is a new Hotline search engine listing trackers, servers, users and files.
About 95% of the servers these days require a login/pass which you can only get by downloading adware (usually XXX related) or signing yourself up to XXX mailing lists. You will find the odd average person who is hosting a server without any such requirements (and to whom you can download or upload freely) but such people are rare.