Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_DisplayID - This is a unique ID for a display for the time it is connected to the system, and is never reused for the lifetime of the application.
HEADER FILE
Defined in SDL3/SDL_video.h
SYNOPSIS
#include "SDL3/SDL.h" typedef Uint32 SDL_DisplayID;
DESCRIPTION
If the display is disconnected and reconnected, it will get a new ID. The value 0 is an invalid ID.
AVAILABILITY
This datatype is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_DisplayID(3type)