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.
Boss Watcher is a combination of the two programs that allow you to watch the screens of the computers of your local network. One program is BWServer. It is running on the remote computer. It sends screenshots to the BWClient program that is running on your computer. The programs use TCP/IP protocol. BWServer starts as a system process and does not have any user interface. BWClient has a convenient interface.