尽管2级“胖客户端”应用的开发很简单，但是任何用户接口或者业务逻辑的改变所导致的软件升级都需要在所有客户端上进行。
Two-tier thick client applications are easy to develop, but any software upgrade because of changes in user interface or business logic has to be rolled out for all the clients.
目前尚不清楚是否较早的应用程序需要使用最新版Informix SDK (3.70xC 1或者最新版)重新编译，但是大多数网站将其作为一个升级过程的一部分进行处理。
It is not yet clear whether older applications will need to be recompiled with the latest Informix SDK version (3.70xc1 or later), but most sites will do this as part of an upgrade process anyway.
如果需要升级固件，那么可以通过参考资料中列出的下载站点或者IBM提供的CD - ROM上的固件来进行升级。
If you need to update the firmware, use the download site listed in Resources, or use the firmware on the IBM-supplied CD-ROM.
虽然对于可扩展性存在有非常多的定义，而这些定义的共同点就是能够添加及合成新的函数，或者基于已有的代码能够进行技术上的升级。
Although there are many definitions, the common theme amongst them is the ability to add and incorporate new functionality, or technical advances, into an existing code base.
业务升级或者新业务的增加、安全控制等等只须在边缘层进行，保证骨干网络的稳定。
To ensure core network's stability and security, service provisioning, new service deployment and security control are performed on the edge of the network…
业务升级或者新业务的增加、安全控制等等只须在边缘层进行，保证骨干网络的稳定。
To ensure core network's stability and security, service provisioning, new service deployment and security control are performed on the edge of the network…
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