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.
When run, this program, in a loop, opens and closes the CD drive and also displays messages. Until the loop is finished, it is possible to terminate the program only by removing it from the task list (Alt-Ctrl-Del). The program does not harm computer hardware and software in any way, but, because of its behavior, it is classified as a Trojan program.