You need to scan for a specific running process. I used the wmi module for this in my app:

http://timgolden.me.uk/python/wmi/index.html

AON LAZIO wrote:
Hi,
How can we find out that there is already a PyQt application running on Windows so when I try to open that same application, it won't open another one? It's like I already have Firefox running and when I open firefox again, it won't open firefox again.
     Thanks

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Passion is my style
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