displaying coor using gldrawpixel

Hi, I would like to know how to display an array containing the coordinates of points( coordinates of a voxel from the octree) using gldrawpixels. That means displaying the coordinates using gldrawpixels in short. In this array, 4 slots are used to indicate a point, eg. array[0] is the normal, array[1] is the x coor, array[2] = y coor & array[3] is the z coor. I am only allowed to use gldrawpixel, not glvertex. Thx.