SDL_WM_SetCaption (3) - Linux Manuals
SDL_WM_SetCaption: Sets the window tile and icon name.
NAME
SDL_WM_SetCaption - Sets the window tile and icon name.SYNOPSIS
#include "SDL.h"
void SDL_WM_SetCaption(const char *title, const char *icon);
DESCRIPTION
Sets the title-bar and icon name of the display window.
SEE ALSO
SDL_WM_GetCaption, SDL_WM_SetIcon