1) Online Class Registration System should be implemented to become a web-based registration software that guides students to register events online or accept the course. The online course registration system for a class is ideal for educational camps, adult schools, corporate training programs, sports camps and online training programs. Online class recording software comes with features such as email-based user accounts, security, automatic scheduling, credit card payment, registration deadline, late fee collection, and multiple course deadline. Furthermore, the online lecture recording system can be fully customized according to your needs.2) ager3) Green computing deals with the efficient and environmentally friendly design, production, operation and disposal of IS-related products, including all types of computers, printers and printer materials. Computers contain many toxic substances, including beryllium, brominated flame retardants, cadmium, lead, mercury, and selenium. As a result, electronics manufacturing employees and suppliers at all stages of the supply chain and manufacturing process are at risk of harmful exposure. It is impossible to guarantee safe recycling or disposal, so it is believed that it is best to eliminate the use of toxic substances. However, recycling companies export large quantities of used electronics to companies in underdeveloped countries. Disposal and remediation operations must be extremely careful to avoid hazardous exposures in recycling operations and leaching of materials such as heavy metals from landfills and incinerator ash. Burning computer components also releases toxic components into the atmosphere, with harmful results for people who burn in short......middle paper......us which contains malicious files including a keylogger, which collects every key pressed on your computer. To create an effective virus, many hackers usually encrypt their virus. This increases the chances that the virus will not be detected by antivirus software used by the victim. To spread the virus, hackers upload fake files related to something completely different that the victim might be interested in. Once the victim downloads the selected file, they get infected by the Trojan horse. Common sites used by hackers are Pirate Bay, a database of torrents ranging from images to full movie downloads. Hackers exploit torrent sites by infecting the file with their Trojan horse. This is the most commonly used method for infecting someone with a virus, however there are dozens of other ways.