软件维护包括升级指定计算机上的操作系统和应用服务器软件。
Software maintenance includes upgrades to both the operating system and the application server software on a given machine.
类似地，许多应用服务器、数据库和其他软件平台都可以配置为将它们的集合呈现为单个实体。
Similarly, many application servers, databases, and other software platforms can be configured in such a way that a collection of them appears to be a single entity.
事实是，基础设施软件产品（如 J2EE 应用服务器）尚未达到多用户操作系统的成熟水平。
The reality is that infrastructure software products, such as J2EE application servers, have not yet reached the maturity level of multi-user operating systems.
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