Some questions...

Hello friends, i have some questions im my head that i can''t stop thinking about, maybe you can help me, so... here they are: 1) How per-pixel lighting is done ? (I know how to do some lights in opengl but i can''t imagine how per-pixel lighting is done. Any tutorial on basics will be great.) 2) How Dynamic lighting is done ? 3) In a game with huge levels, imagine that i want a wall to have a texture, and other wall to have a diferent texture, well...this information(this wall has this texture and that wall has that one) is stored by level editor in file wich stores information about the level ? 4) I have a room created in 3d studio max and i want to put some objects inside of it, well... the objects are attached to the room in 3d studio max and then are all loaded as a single file or they are loaded separately and then put it there by coordinates ? It''s all for now, sorry my bad english, i really apreciate your atention and thanks you all again. Bye