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

NAME
SDL_PenID - SDL pen instance IDs.
HEADER FILE
Defined in SDL3/SDL_pen.h
SYNOPSIS
#include "SDL3/SDL.h" typedef Uint32 SDL_PenID;
DESCRIPTION
Zero is used to signify an invalid/null device. These show up in pen events when SDL sees input from them. They remain consistent as long as SDL can recognize a tool to be the same pen; but if a pen physically leaves the area and returns, it might get a new ID.
AVAILABILITY
This datatype is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_PenID(3type)