> code in below,  when close the app window.  the two ping process can not kill 
> auto and keep in the windows 7 task list.
>
> During running, ping process under Python.exe as two thread. When app exit,  
> this two process move the system process and keep running there.
>
> could someone help to correct it.?
> Many thanks.

Hello,
That's a lot of code to read through.
I recommend you read
http://www.catb.org/~esr/faqs/smart-questions.html and then re-submit.
Good luck.
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