实践证明了用中断实现前后台切换、对DOS重入问题的处理、嵌套和屏幕保护等都是有效的解决方法。
The practice proves that interrupt is a useful method for foreground -background exchanging, the DOS reenter processing, the embedding and screen contents saving.
对于AIX,iptrace是一个后台守护进程，因此您必须启动和停止该工具，以便对进程状态进行切换。
With AIX, the iptrace is a background daemon, so you must explicitly start and stop the tool to switch the process on and off. For example, to start, type.
在这种情况下，当无法联系主要服务器，或者它由于某种问题而关闭时，secldapclntd后台程序将自动切换到辅助服务器。
In the situation, when the primary server cannot be contacted or if it goes down due to some problem, secldapclntd daemon automatically switches to the secondary server.
MacRuby 0.6发布之后，用户发现了一个问题，在运行某代码段的时候，从后台线程切换到主线程会导致程序崩溃。
One issue that was found after the release of MacRuby 0.6 seems to cause problems with scheduling a block to run on the main thread from a background thread.
当用户切换时，一个用户的登录会话被激活而其他用户的会话继续在后台运行。
With fast user switching, one user's login session is active while the sessions of other users continue to run in the background.
你是否经常在黑莓上来回的切换后台程序就是为了拷贝文本？
Ever find yourself going back and forth between screens to copy text on your BlackBerry?
这就意味着当你的后台进程实际弹出一个用户界面时，用户可能已经切换到系统的例外部份并执行其他工作，如打电话等。
This means that when your background process actually fires up that UI, the user could be way over in another part of the system, doing something else - such as taking a phone call.
任务可以在前台与后台之间切换；
(应用在后台，不执行代码)，系统自动将应用切换到这个状态而不给应用通知。
The app is in the background but is not executing code. The system moves apps to this state automatically and does not notify them before doing so.
(应用在后台，不执行代码)，系统自动将应用切换到这个状态而不给应用通知。
The app is in the background but is not executing code. The system moves apps to this state automatically and does not notify them before doing so.
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