tailieunhanh - Windows 2000 Terninal Services P2

Businesses are teeing up to new challenges brought on by an increasingly virtual environment. Telecommuting has increased the number of remote access users who need to access applications with specific business configurations. | 2 Chapter 1 Challenges of the Virtual Environment Introduction Businesses are teeing up to new challenges brought on by an increasingly virtual environment. Telecommuting has increased the number of remote access users who need to access applications with specific business configurations. The pervasive use of the Internet provides an easy nearly universal avenue of connectivity although connections are sometimes slow. The use of hand-held computing has exploded but questions remain as to what kind of applications can be used. For a business facing these types of challenges the hole in one can be found in thin-client technology. The leader in this technology is Citrix whose main product is MetaFrame. MetaFrame runs over Microsoft s Windows 2000 with Terminal Services and provides fast consistent access to business applications. With Citrix MetaFrame the reach of business applications can be extended over an enterprise network and the public Internet. What Defines a Mainframe Mainframe computers are considered to be a notch below supercomputers and a step above minicomputers in the hierarchy of processing. In many ways mainframes are considerably more powerful than supercomputers because they can support more simultaneous programs. Supercomputers are considered faster however because they can execute a single process faster than a typical mainframe. Depending on how a company wants to market a system the same machine that could serve as a mainframe for one company could be a minicomputer at another. Today the largest mainframe manufacturers are Unisys and surprise surprise IBM. Mainframes work on the model of centralized computing. Although a mainframe may be no faster than a desktop computer in raw speed mainframes use peripheral channels individual PCs in their own right to handle Input Output IO processes. This frees up considerable processing power. Mainframes can have multiple ports into high-speed memory caches and separate machines to coordinate IO operations