OpenGL draws things, that's all it does. It doesn
open windows, it won read the mouse or keyboard,
it doesn't store data or read/write files.
OpenGL can be used to display the output of a CAD
program, sure, but the actual "CAD" part is up to
<\___/> "To err is human, to moo bovine."
/ O O \
\_____/ FTB. For email, remove my socks.