将指定的进程设置为调试器中的活动进程。
Sets the specified process as the active process in the debugger.
活动程序即定义调试器所显示的数据的程序。
The active program is the program that defines the data displayed by the debugger.
由于句柄会影响垃圾回收器的性能，因此调试器本身应将一次处于活动状态的句柄数限制为相对较小的数目(大约256个)。
Because handles affect the performance of the garbage collector, the debugger should limit itself to a relatively small number of handles (about 256) that are active at a time.
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