They generally keep track of pointer movements and changes in input focus and adjust the enlarged view accordingly.

它们通常不断跟踪指针的移动和输入焦点的改变，然后相应地调整放大的窗口。

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This simple design, possible because the data obeys strict LIFO order, means that no complex data structure is needed to track stack contents - a simple pointer to the top of the stack will do.

这种简单的设计，很有可能是考虑到数据操作都符合后进先出（LIFO ）规则，这意味着访问栈的内容并不需要复杂的数据结构，一个简单的栈顶指针就能搞定一切。

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The stack is coordinated with a stack pointer that keeps track of storage and retrieval of each byte or word of information in the stack.

栈和一个栈指针配合工作，栈指针随时指示要存取的每个字或字节信息在栈中的位置。

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