In the J2EE Model 2 architecture, a servlet is the UI controller, responsible for getting input data, calling some back-end business logic, and then deciding what JSP to forward to.

在J2EE Model 2体系结构中，Servlet是UI控制器，负责获取输入数据，调用某些后端的业务逻辑，然后决定转发到哪一个JSP。

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It features an integrated Traffic Manager that monitors data and calling usage, warning the user when they are approaching their monthly limits.

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Grid computing attempts to connect up the islands of processing power and data in the world's universities and to standardise ways of interrogating data and calling on huge amounts of computer power.

BBC: Why the future will be easier to use

It is ideal for tasks that require lots of interactivity, for example, calling up data from a hard drive in response to a command from a user.

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