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Visual Studio
A family of Microsoft suites of integrated development tools for building applications for Windows, the web and mobile devices.
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In C# you can press <Alt+F12> or <F12> to view the definition. It seems that Code Definition Window is for C++ (https://learn.microsoft.com/en-us/visualstudio/ide/viewing-the-structure-of-code?view=vs-2019#code-definition-window-c).