My 9 year old son has a severe visual imparement. As a result on my 24 inch imac he finds it best when the resolution is set to 1280 x 800. I on the other hand find that the highest resolution works best for me. He has a hard time finding the menu to change the resolution when its in its highest resolution mode without my help, so I would like to set it up that when he logs in as him the resolution is automatically set. I can not seem to figure out how to tie that setting to his account... any advice will be greatly appreciated.