首先是移动代理系统的安全问题，特别是恶意主机问题；其次是电子商务中的公平交易问题。

First is the security of mobile agent system, especially the malicious host problem; Second is the fair exchange problem in electronic commerce.

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移动代理系统的名字服务有其自身特有的特殊性。

The name service in mobile agent system has its own speciality.

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网格；远程教育；学习支持系统；移动代理；模型。

Grid; Distance Education; Learning Support System; Mobile Agent; Model.

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