_set_app_type

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An internal function used at startup to tell the CRT whether the app is a console app or a GUI app.

typedef enum _crt_app_type
{
    _crt_unknown_app,
    _crt_console_app,
    _crt_gui_app
} _crt_app_type;

void __cdecl _set_app_type(
    _crt_app_type appType
    ); 

appType
A value that indicates the application type. The possible values are:

Normally, you do not need to call this function. It is part of the C runtime startup code that executes before main is called in your app.