R PG程序更新通过键访问的行之前，必须执行一个读操作，以便锁定该行，进行更新。
Before an RPG program updates a row accessed by a key it must perform a read operation to lock the row for update intent.
人们还希望无须触动应用程序主窗口就能直接访问命令窗口，并能用tab键在各屏幕间切换以找到他们所需的信息。
oPeople also expect to be able to access command windows without interfering with the application's main window, and to be able to tab through various screens to find the information they need.
这个模型在 iPhone 或 iPod 设备上是很有用的，因为按钮选项卡可以提供一系列应用程序快捷键来访问应用程序功能。
This model is useful for an iPhone or iPod device, where a button tab provides a series of shortcuts to reach application functions.
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