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// Written by Ch. Tronche (http://tronche.lri.fr:8000/)// Copyright by the author. This is unmaintained, no-warranty free software. // Please use freely. It is appreciated (but by no means mandatory) to// acknowledge the author's contribution. Thank you.// Started on Thu Jun 26 23:29:03 1997//// Xlib tutorial: 1st program// Make a window appear on the screen.//#include 
   
     // Every Xlib program must include this#include 
    
        // I include this to test return values the lazy way#include 
     
         // So we got the profile for 10 seconds#define NIL (0)       // A name for the void pointermain(){      Display *dpy = XOpenDisplay(NIL);      assert(dpy);      Window w = XCreateWindow(dpy, DefaultRootWindow(dpy), 0, 0, 			       200, 100, 0, 			       CopyFromParent, CopyFromParent, CopyFromParent,			       NIL, 0);      XMapWindow(dpy, w);      XFlush(dpy);      sleep(10);}