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 (3.70 xC 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.
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