System monitors, typically non-commercial, may monitor and capture your computer activity, including recording all keystrokes, e-mails, chat room dialogue, instant message dialogue, Web sites visited, usernames, passwords, and programs run. This type of program may be capable of taking screen shots of your desktop at scheduled intervals and storing the information on your computer in an encrypted log file for later retrieval. These log files may be sent to a pre-defined e-mail address. A system monitor can run in the background, hiding its presence. These programs typically install via other threats, such as music downloads and Trojan downloaders. These system monitors may allow an unauthorized, third party to view potentially sensitive information, such as passwords, e-mail, and chat room conversation.