###### (This is the legacy documentation for stable SDL2, the current stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current development version.)
# SDL_GUID

An [SDL_GUID](SDL_GUID) is a 128-bit identifier.

## Header File

Defined in [SDL_guid.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_guid.h)

## Syntax

```c
typedef struct SDL_GUID {
    Uint8 data[16];
} SDL_GUID;
```

## Remarks

This is an acronym for "Globally Unique ID."

While a GUID can be used to assign a unique value to almost anything, in
SDL these are largely used to identify input devices across runs of SDL
programs on the same platform.If the device is detached and then
re-attached to a different port, or if the base system is rebooted, the
device should still report the same GUID.

GUIDs are as precise as possible but are not guaranteed to distinguish
physically distinct but equivalent devices. For example, two game
controllers from the same vendor with the same product ID and revision may
have the same GUID.

GUIDs may be platform-dependent (i.e., the same device may report different
GUIDs on different operating systems).

----
[CategoryAPI](CategoryAPI), [CategoryAPIStruct](CategoryAPIStruct), [CategoryGUID](CategoryGUID)