Displaying a point sprite in OpenGL

After looking at a bunch of examples on how to use point sprites in OpenGL and seeing some with blatant errors and leaving out key things like setting the point size, I've decided to cut and paste my point sprite code snippet from PointSprite::draw()

 // Get the max point size
  glGetFloatv(GL_POINT_SIZE_MAX_ARB, &_maxSize );

  // Get the minimum point size. Not necessary for this example, but interesting to know
  glGetFloatv(GL_POINT_SIZE_MIN_ARB, &_minSize );

  // Enable point sprites
  glEnable(GL_POINT_SPRITE);

  // I've also seen the following used to enable point sprites:
  //  glEnable(GL_POINT_SPRITE_ARB);
  // but I only needed the first one. Maybe it's because I'm using GLEW

  // Replace the texture coordinates across the point sprite
  glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE);

  // Set the point size.
  glPointSize(_maxSize);

  // I saw some examples doing the following:
  // glPointParameteri(GL_POINT_SIZE, _maxSize);
  // But this didn't do anything for me. glPointSize was
  // the only thing that actually set the point size

  // Set a color. You'll want to use a nice texture map that you blend
  // using a shader, but this is a simple example to get you started
  glColor3f(1.0, 1.0, 1.0);

  // Begin points. In real life, you'd use a vertex array.
  glBegin(GL_POINTS);

  // A point
  glVertex3f(0.0, 0.0, -1.0);

  // Done.
  glEnd();