###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.) # SDL_UnregisterApp Deregister the win32 window class from an [SDL_RegisterApp](SDL_RegisterApp) call. ## Header File Defined in [SDL_main.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_main.h) ## Syntax ```c void SDL_UnregisterApp(void); ``` ## Remarks This can be called to undo the effects of [SDL_RegisterApp](SDL_RegisterApp). Most applications do not need to, and should not, call this directly; SDL will call it when deinitializing the video subsystem. It is safe to call this multiple times, as long as every call is eventually paired with a prior call to [SDL_RegisterApp](SDL_RegisterApp). The window class will only be deregistered when the registration counter in [SDL_RegisterApp](SDL_RegisterApp) decrements to zero through calls to this function. ## Version This function is available since SDL 2.0.2. ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryMain](CategoryMain)