After the pipe has been created (or if one already exists), each pipe's output is read into the recorded eventvariable for that window.
在创建了管道(或者如果已经存在一个管道)后,每个管道的输出将被读入到该窗口记录的事件变量中。
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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.