Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
From the Website:
Why CAFEiNi is better than other backdoors (like NetBus): -can kill more than 30 Windows antiviruses and antibackdoors from memory -automatic update of server by http -doesn't install itself into registry (when can or install under random name) -written in Visual C++ (smaller and faster than Delphi) -you can control remote computer by telnet (eg. from Unix) -works on Windows 95/98/ME and also Windows NT/2000 -with CAFEiNiclient you can control multiple computers (eg. open CD-ROM doors on 10 computers with one button click) -full multitasking (eg. you can upload and download files in one time from multiple computers) -some new backdoors commands (especially with desktop) -client is very easy to use, like old good Netbus 1.x -includes configurator for server (edit server)'