The code? It's a terminal command lol. The basic format for setting things is "set [property] [element/particle#] [value]". All element names are aliased (e.g. set life 4 0 can be replaced with set life fire 0), all can be used to set that property for all elements. An example would be set ctype lava plsm which would set the ctype of all lava to plasma. In turn, you can set a single particles property based on its ID. e.g. set temp 235007 9963.00, which would set particle 235007's temperature to 9963 degrees kelvin(9725.85 degrees celsius).