In order to access the internet, you must have this protocol stack installed. Trojan horse - A program that appears legitimate, but performs some illicit activity when it is run. It may be used to locate password information or make the system more vulnerable to future entry or simply destroy programs or data on the hard disk. A Trojan horse is similar to a virus, except that it does not replicate itself. It stays in the computer, doing its damage or allowing somebody from a remote site to take control of the computer.
Trojans often sneak in attached to a free game or other utility.
Backup power used when the electrical power fails or drops to an unacceptable voltage level. A surge protector filters out surges and spikes, and a voltage regulator maintains uniform voltage during a brownout, but a UPS keeps a computer running when there is no electrical power. UPS systems typically provide surge suppression and may also provide voltage regulation. The address that defines the route to a file on the Web or any other Internet facility. URLs are typed into the browser to access Web pages, and URLs are embedded within the pages themselves to provide the hypertext links to other pages.