Specify the behavior of Alt+Tab while the keyboard is grabbed.
Defined in SDL_hints.h
#define SDL_HINT_ALLOW_ALT_TAB_WHILE_GRABBED "SDL_ALLOW_ALT_TAB_WHILE_GRABBED"
By default, SDL emulates Alt+Tab functionality while the keyboard is grabbed and your window is full-screen. This prevents the user from getting stuck in your application if you've enabled keyboard grab.
The variable can be set to the following values: