| CarContact | 16 bytes : one car in a contact - two of these in the IS_CON |
| CarContOBJ | 8 bytes : car in a contact with an object |
| CompCar | Car info in 28 bytes |
| IS_ACR | Admin Command Report - any user typed an admin command |
| IS_AXI | AutoX Info |
| IS_AXM | AutoX Multiple objects - variable size |
| IS_AXO | AutoX Object |
| IS_BFN | Button FunctioN |
| IS_BTC | BuTton Click |
| IS_BTN | BuTtoN |
| IS_BTT | BuTton Type |
| IS_CCH | Camera CHange |
| IS_CNL | ConN Leave |
| IS_CON | CONtact - between two cars (A and B are sorted by PLID) |
| IS_CPP | Cam Pos Pack |
| IS_CPR | Conn Player Rename |
| IS_CRS | Car ReSet |
| IS_FIN | FINished race notification |
| IS_FLG | FLaG |
| IS_HLV | Hot Lap Validity - illegal ground / hit wall / speeding in pit lane |
| IS_III | InsIm Info |
| IS_ISI | InSim Init - packet to initialise the InSim system |
| IS_ISM | InSim Multi |
| IS_LAP | LAP time |
| IS_MCI | Multi Car Info |
| IS_MOD | Send to LFS to change screen mode |
| IS_MSL | MSg Local - message to appear on local computer only |
| IS_MSO | MSg Out - system messages and user messages |
| IS_MST | MSG Type - send to LFS to type message or command |
| IS_MSX | MSg eXtended - like MST but longer (not for commands) |
| IS_MTC | Msg To Connection - hosts only - send to a connection / a player / all |
| IS_NCN | New ConN |
| IS_NLP | Node and Lap Packet |
| IS_NPL | New PLayer joining race |
| IS_OBH | OBject Hit - car hit an autocross object or an unknown object |
| IS_PEN | PENalty |
| IS_PFL | Player FLags |
| IS_PIT | PIT stop |
| IS_PLA | Pit LAne |
| IS_PLC | PLayer Cars |
| IS_PLL | PLayer Leave race |
| IS_PLP | PLayer Pits |
| IS_PSF | Pit Stop Finished |
| IS_REO | REOrder |
| IS_RES | RESult |
| IS_RIP | Replay Information Packet |
| IS_RST | Race STart |
| IS_SCC | Set Car Camera |
| IS_SCH | Single CHaracter |
| IS_SFP | State Flags Pack |
| IS_SMALL | IS_SMALL - used for various requests, replies and reports |
| IS_SPX | SPlit X time |
| IS_SSH | ScreenSHot |
| IS_STA | StatePack |
| IS_TINY | IS_TINY - used for various requests, replies and reports |
| IS_TOC | Take Over Car |
| IS_VER | This version packet can be sent on request |
| IS_VTN | VoTe Notify |
| NodeLap | Car info in 6 bytes |
| ObjectInfo | Info about a single object - explained in the layout file format |
| OutGaugePack | OutGaugePack |
| OutSimPack | OutSimPack |
1.7.3
