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.
This is a primitive Trojan, written in DOS command language. It disconnects the mathematical coprocessor. As the result the computer starts to run extremely slowly. Windows 95 may lose functionality due to the action of the Trojan.