multi windows at multi-display environment

Hi.

I have a Linux(FC6) PC having two GeForce video cards and using them as a multi-display environment.
There, the DISPLAY environment value in terminal of first display is :0.0, and the value in terminal of second display is :0.1.
So, I want to show tow windows, one window is in first display, and another one windows is in second display.
From document, glutInit function’s argument can control the output display, so I wrote program as below:

GLuint glutWindowHandle[2];

void display0(void)
{
  glClear(GL_COLOR_BUFFER_BIT);
  glFlush();
}

void display1(void)
{
  glClear(GL_COLOR_BUFFER_BIT);
  glFlush();
}

int main()
{
  {
    int argc		= 3;
    char *argv[]	= {"test_0", "-display", ":0.0"};
    glutInit ( &argc, argv );
    glutWindowHandle[0] = glutCreateWindow("test 0");
    glutInitDisplayMode(GLUT_RGBA);
    glutDisplayFunc(display0);
    glClearColor(0.0, 0.0, 1.0, 1.0);
  }
  {
    int argc		= 3;
    char *argv[]	= {"test_1", "-display", ":0.1"};
    glutInit ( &argc, argv );
    glutWindowHandle[1] = glutCreateWindow("test 1");
    glutInitDisplayMode(GLUT_RGBA);
    glutDisplayFunc(display1);
    glClearColor(0.0, 1.0, 0.0, 1.0);
  }
  glutMainLoop();
  return 0;
}

but I got the message:

 freeglut (./test_0): illegal glutInit() reinitialization attempt 

Are there any solutions to resolve this problem ?

Thanks.