The purpose of Anti-Trojan Shield is to detect and remove trojan horses or well-known viruses completely. Monitor is the element of ATS package that constantly monitors the virus-free health of your PC. Manager allows you to scan the computer in many different ways with a press of one button. Update allows you to update virus/worm/trojan definition databases without leaving the program. ATS manager files can also be updated in a convenient and quick way. Trojan definitions are released at least weekly, but mostly more often. That is why nothing else protects you better than Anti-Trojan Shield..