diff --git a/progs/tests/multiwindow.c b/progs/tests/multiwindow.c
new file mode 100644
index 0000000..e004b03
--- /dev/null
+++ b/progs/tests/multiwindow.c
@@ -0,0 +1,169 @@
+/* $Id: multiwindow.c,v 1.1 2001/08/21 14:25:31 brianp Exp $ */
+
+/*
+ * A skeleton/template GLUT program
+ *
+ * Written by Brian Paul and in the public domain.
+ */
+
+
+/*
+ * $Log: multiwindow.c,v $
+ * Revision 1.1  2001/08/21 14:25:31  brianp
+ * simple multi-window GLUT test prog
+ *
+ * Revision 1.1.1.1  1999/08/19 00:55:42  jtg
+ * Imported sources
+ *
+ * Revision 1.2  1998/11/07 14:20:14  brianp
+ * added simple rotation, animation of cube
+ *
+ * Revision 1.1  1998/11/07 14:14:37  brianp
+ * Initial revision
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+static GLint Window[2];
+
+static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
+static GLboolean Anim = GL_TRUE;
+
+
+static void Idle( void )
+{
+   Xrot += 3.0;
+   Yrot += 4.0;
+   Zrot += 2.0;
+
+   glutSetWindow(Window[0]);
+   glutPostRedisplay();
+   glutSetWindow(Window[1]);
+   glutPostRedisplay();
+}
+
+
+static void Display0( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glEnable(GL_DEPTH_TEST);
+
+   glPushMatrix();
+   glRotatef(Xrot, 1, 0, 0);
+   glRotatef(Yrot, 0, 1, 0);
+   glRotatef(Zrot, 0, 0, 1);
+
+   glColor3f(0, 1, 0);
+   glutSolidCube(2.0);
+
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void Display1( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glPushMatrix();
+   glRotatef(Xrot, 1, 0, 0);
+   glRotatef(Yrot, 0, 1, 0);
+   glRotatef(Zrot, 0, 0, 1);
+
+   glShadeModel(GL_FLAT);
+
+   glBegin(GL_TRIANGLE_STRIP);
+   glColor3f(1, 0, 0);
+   glVertex2f(-1, -1);
+   glVertex2f( 1, -1);
+   glColor3f(1, 0, 0);
+   glVertex2f( -1, 1);
+   glColor3f(0, 0, 1);
+   glVertex2f( 1, 1);
+   glEnd();
+
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -15.0 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   const GLfloat step = 3.0;
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 'a':
+         Anim = !Anim;
+         if (Anim)
+            glutIdleFunc(Idle);
+         else
+            glutIdleFunc(NULL);
+         break;
+      case 'z':
+         Zrot -= step;
+         break;
+      case 'Z':
+         Zrot += step;
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( 400, 400 );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+   Window[0] = glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display0 );
+   glutIdleFunc(Idle);
+   printf("GL_RENDERER[0] = %s\n", (char *) glGetString(GL_RENDERER));
+
+   glutInitWindowPosition( 500, 0 );
+   glutInitWindowSize( 400, 400 );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+   Window[1] = glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display1 );
+   glutIdleFunc(Idle);
+   printf("GL_RENDERER[1] = %s\n", (char *) glGetString(GL_RENDERER));
+
+   glutMainLoop();
+
+   return 0;
+}