.... with them," (Holmes & Dishman, 1994, p. 6). Having been created in their most rudimentary form nearly two decades ago, the technology that supports MUD interaction is well developed and has spawned a new variety of communicative environment, one that thousands if not millions of users have found fiercely compelling. Since MUDs are generally restricted to text-based interaction (some support ANSI codes, and the graphical MUDs are gaining popularity), one might expect that the interactions therein are characterized by a lack of regulating feedback, dramaturgical weakness, few status cues, and social anonymity, as Kiesler and her col .....

.... Ltd. of Montreal with financial support from the Natural Sciences and Engineering Research Council of Canada. Their eye-tracker can record and analyze accurately up to 500 eye positions per second. The system works by means of capturing and processing the reflections of a low-level beam o f invisible infra-red light shone onto the eye. Multi-element arrays capture the image of the eye and digitize the information, which is then processed in real time by a fast, dedicated signal processing unit. The difference in position between the ligh tre of the pupil reveals the instantaneous direction of gaze. Developmen .....

.... The software for PCs is extensive and the students can obtain all the information he/she needs for an assignment. The time that was spent running to the library has been cut by about ninety percent. This is due to the new and ever improving software that is produced for personal computers. Secondly, the computer has become a strong teaching tool in many schools across the nation and maybe the world. Since the introduction of computers in the classrooms, students have shown a progression of their skills in reading and mathematics. There are many tutorial software programs that are readily available for the students who are hav .....

.... it can be instructive to look at the security record of other parts of the international communications infrastructure. The first, biggest error that designers seem to repeat is adoption of the "security through obscurity" strategy. Time and again, attempts to keep a system safe by keeping its vulnerabilities secret have failed. Consider, for example, the running war between AT&T and the phone phreaks. When hostilities began in the 1960s, phreaks could manipulate with relative ease the long-distance network in order to make unpaid telephone calls by playing certain tones into the receiver. One phreak, John Draper, was known as .....

.... arranging a coprocessor alongside a microprocessor. One technique is to provide the coprocessor with an instruction interpreter and program counter. Each instruction fetched from memory is examined by both the MPU and the coprocessor. If it is a MPU instruction, the MPU executes it; otherwise the coprocessor executes it. It can be seen that this solution is feasible, but by no means simple, as it would be difficult to keep the MPU and coprocessor in step. Another technique is to equip the microprocessor with a special bus to communicate with the external coprocessor. Whenever the microprocessor encounters an operation that require .....

.... and physically violent offenders under control. But computer criminals--ranging in age from preteen to senior citizen--will have ample opportunities to violate citizens' rights for fun and profit, and stopping them will require much more effort. Currently, we have only primitive knowledge about these lawbreakers: Typically, they are seen only as nuisances or even admired as innovators or computer whizzes. But increasingly, the "hacker" is being replaced by the menacing "cracker"--an individual or member of a group intent on using the Internet for illegal profit or terrorism. Access to the Internet has begun to expand geometri .....

.... purged manually with the SALVAGE utility, which is a great way to make sure that a file you don't want others to see is completely removed from the system!!! For a user or administrator to retrieve a file using SALVAGE, the create right (right to edit and read a directory area or file) must be assigned to the directory in which the file resides. If the directory still exists, the files are put back into the directory from which they were deleted. If the file being salvaged has the same name as a file that already exists, then a prompt will be presented to rename the file being salvaged. Since NetWare keeps track of the files .....

.... for a glorified typewriter. Several years after they introduction of the BASIC system, Apple introduced a new line of computers called the Macintosh. These Macintosh computers were extreme easy to use, and were about the same price of a computer that used BASIC. Apple's business exploded with the Mac, Macintosh were put in schools and millions of homes proving that the computer was an extreme useful tool after all. The Macintosh made such an impact on the computer industry that IBM and Microsoft joined forces to produce the MS-DOS system. The MS-DOS system was the basis of the Windows program, which made Bill Gates the mult .....

.... the magnetic tape drive. Magnetic tape is a sequential data storage medium. To read data, a tape drive must wind through the spool of tape to the exact location of the desired information. To write, the tape drive encodes data sequentially on the tape. Because tape drives cannot randomly access or write data like disk drives, and are thus much slower, they have been replaced as the primary storage device with the hard drive. The hard drive is composed of thin layers of rigid magnetic platters stacked on top of one another like records in a jukebox, and the heads that read and write data to the spinning platters resemble the arm o .....

.... are four major types of devices currently in use: the head-mounted display (HMD), the binocular omni-oriented monitor (BOOM), the workstation "desktop" model (DEERING), and the projection model (CAVE). The HMD is a tracked helmet worn by the user that provides small television screens properly placed in front of the eyes. Although modest in comparison with other VR devices, it is not lightweight enough to prevent fatigue, and the screen resolution is typically medium at best. The BOOM also uses small television screens, but the angle of view is improved by wide-angle optics. The screens are suspended from a mechanical arm articu .....