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Microsoft Internet Security and Acceleration (ISA) Server implements a cache of frequently-requested objects to improve network performance. You can configure the cache to ensure that it contains the data that is most frequently used by the organization or accessed by your Internet clients. For more information, see Internet acceleration.
ISA Server can be used to allow communication between your local network and the Internet. Communication may be internal clients accessing servers on the Internet—in this case, ISA Server implements forward caching. Communication might be external clients accessing internal, publishing servers—for this case, ISA Server features reverse caching. Both scenarios can benefit from ISA Server's ability to cache information, making it more quickly available to users.
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