Is there a way to give only one light which can make visibility to the objects from everywhere?
And than I can use a sun or lamp to make only shadow.
Kind of opposite working of real life. 
you can use shadeless fro object to have constant light intensity form all around
but not certain you can add lamp over that
check in F5 panel
salutations
1.???There is a hemi light or AO lighting and no automagic button ‘light as I wish’
2.There is button ‘Onlyshadow’ - except hemi light
3.There is button ‘Negative’
Further explanation for B2.4x -> http://wiki.blender.org/index.php/Doc:Manual#Lighting