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Decision support systems (DSS) and expert systems (ES), have joined other human beings interactive auxiliary systems. Decision support systems and expert systems usually work on a relatively limited-in comparison with a huge data base-knowledge base (KB) rather than a data base (DB) and have relatively large processing operations. These systems have the capability of self-inserting and self-correcting of information housed in the knowledge base. In other words, the facts or rules inferred or concluded from available facts and conditions, could be added to the knowledge base automatically without any contradictions or inconsistencies. In the other hand, search engines and web directories usually work on massive data bases, which could not be updated automatically as a result of processing, unless some special software like Web Spiders do that job for it. Intelligent and intellectual processing functions in these systems are relatively smaller than those of members of first group. In second group much of processing time will be spent on tasks related to searching, categorizing and sorting information.