beginner question about dots

new to opengl and want to learn some basic things first.
i know how to draw dots, but how do i draw lines from one point to another?

that is very very simple. Instead of:

glBegin( GL_POINTS);
glVertex(…);//dot 1
glVertex(…);//dot 2
glEnd();

type:

glBegin( GL_LINES);
glVertex(…);//dot 1
glVertex(…);//dot 2
glEnd();

go to Nehe!

http://nehe.gamedev.net/