pixel-by-pixel drawing of objects

Can someone please help me with pixel by pixel drawing of objects? I want to try to understand the dynamics of what OpenGL is doing in the background before I move on to more difficult things. Can someone please direct me to where, or explain themselves, on how I would go about drawings a line pixel by pixel(instead of just using glBegin(GL_LINES))? Thanks.

try this site: http://www.opengl.org/developers/documentation/man_pages/hardcopy/GL/html/

it has a lot of the functions OpenGL has to offer, if not all of them. There is a drawpixels function under the gl/ library, may want to look at that.