Data Structures

Here are the data structures with brief descriptions:

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