Hi, I have been reading OpenGL Game Programming, and they talk of a CNode class that can manage data. It is a linked list, and they use it in the game and the SimpEngine they develop in the book, but I can''t seem to figure out what it''s there for. What kind of data does it store. When is a new node created? Also, I am developing a 2D space invaders type game, my first attempt at creating an engine, and so I was wondering if this kind of class would be useful (although I am not sure how), and if it is, how would I implement it? Thanks