Ok, I've seen them in Hammer, I've seen them work in various games TF2 HL, etc but does anyone know how they actually work and how you code them? I would like a cart to go down track 1, then the next cart to go down track 2 ant then the next cart that comes along down track 1. Basically I want to make some randomness in something repedative. Or the first 4 carts do the above and then the 5th takes a diferent route from the other. How do I code it - I'm not getting the expected results - thanks.