README file from "viewports" directory
~opengl1/examples/viewports README Copyright 1991-1996, Silicon Graphics, Inc. Technical Education Development All Rights Reserved. viewport.c: demonstrates how to set up more than one viewport in a window. Also demonstrates how the aspect ratio can effect the ways objects appear in the window SPACE key - toggle which viewport the grid is drawn in Escape Key - exit the program aspect.c: demonstrates how to set up a viewport with a 1-to-1 aspect ratio Escape Key - exit the program
Source
Documentation
Reference