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Most applications on Windows are either of the IMAGE_SUBSYSTEM_WINDOWS_GUI or IMAGE_SUBSYSTEM_WINDOWS_CUI type. The former is a typical graphical, windowed application, whereas the latter is what's commonly called a console or terminal application. When running an application marked as IMAGE_SUBSYSTEM_WINDOWS_CUI it'll be allocated a console, unless it's executed inside an existing console session. Additionally, executing such an application inside a shell like CMD or PowerShell will block until the application has finished executing. Neither of these are true for IMAGE_SUBSYSTEM_WINDOWS_GUI applications. It'll neither be allocated a console, nor block execution inside a shell.
Now what if you want to write an application that seems like a graphical application when run from Explorer, but you can also write debug output to the console, if run inside an existing console session? To achieve this, build your application as an IMAGE_SUBSYSTEM_WINDOWS_CUI one (for instance with /SUBSYSTEM:CONSOLE in MSVC) and add the following application manifest:
The IMAGE_SUBSYSTEM_WINDOWS_CUI type informs shells that they need to block until your application has finished executing, while the application manifest informs the operating system to skip allocating a console.
