本文的第一部分介绍当 Linux 内核（Linux 机器的的“核心”）加载后，一个 Linux 系统怎样在后台启动。
The first part of this article covers the background of how a Linux system is started once the Linux kernel (the "core" of the Linux machine) has loaded.
目前3.0版本只允许少数核心应用程序，如iPod和邮件，在后台运行而另一个应用程序处于活动的状态。
The current iPhone OS (3.0) only allows a few core apps, such as iPod and Mail, to run in the background while another app is active.
如果集群(应用程序部署目标)位于不同核心组的话，那么就需要在后端cell中使用CGBS。
CGBS is required in the back-end cell if the clusters (application deployment targets) are located in different core groups.
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