To judge whether the application is the same instance, very practical

4.如何判断应用程序是否有相同实例存在？\MainFrm.cpp
......................................\MainFrm.h
......................................\ReadMe.txt
......................................\..lease\Test.exe
......................................\res\Test.ico
......................................\...\Test.manifest
......................................\...\Test.rc2
......................................\...\TestDoc.ico
......................................\...\Toolbar.bmp
......................................\Resource.h
......................................\stdafx.cpp
......................................\stdafx.h
......................................\Test.cpp
......................................\Test.h
......................................\Test.ncb
......................................\Test.rc
......................................\Test.sln
......................................\Test.suo
......................................\Test.vcproj
......................................\TestDoc.cpp
......................................\TestDoc.h
......................................\TestView.cpp
......................................\TestView.h
......................................\Release
......................................\res
4.如何判断应用程序是否有相同实例存在？

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