Sorry to keep bothering you guys. One of these days I will get it right. OK so I'm using OpenGL to draw some simple polygons on the screen for practice. Here's what I tried:

       glBegin(GL_QUADS);
           glVertex3f(1.0, 1.0, -10.0);
           glVertex3f(1.0, 2.0, -10.0);
           glVertex3f(2.0, 1.0, -10.0);
           glVertex3f(2.0, 2.0, -10.0);
       glEnd();

But what shows up is unexpected. It shows a strange looking quadrilateral that has five sides yet I specified four vertices. The first parameter of glVertex3f is the x coordinate in space, the second one being the y coordinate, and the last one being the z coordinate correct? So Then wouldn't this code draw out a square on the screen? Not sure why that shape is showing up. Thanks for any help.

the code you posted looks correct

maybe the problem is elsewhere in your code

I used the code from this topic (the last post):

http://www.gamedev.net/community/forums/topic.asp?topic_id=294988