尤其是，它将设置一个全局计数器，以对处于活动状态的事件处理程序进行计数；另外，还要设置一个变量，以在列表中保存事件处理程序的结果。
Especially, it sets up a global counter that counts the number of active event handlers as well as a variable that holds the results of the event handlers in a list.
内存中的一块留用存储区，当程序中断产生时，CPU自动在其中保存程序计数器和工作寄存器的内容。
A reserved area of memory where the CPU automatically saves the program counter and the contents of working registers when a program interrupt occurs.
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