That's the traditional term, but it has specific meaning in game network programming. For instance we never send back the "error accumulated" to the server. Ins

That's the traditional term, but it has specific meaning in game network programming. For instance we never send back the "error accumulated" to the server. Instead the server usually sends a PVS(potentially visible set) that the client handles displaying in a meaningful way(and reconciling and discrepancies). This PVS set is usually absolute values but at a discrete snapshot in time(of which the client can never be certain due to latency and there not being a single global clock). The client is basically guessing where the simulation is going and then smoothly handling(normally interpolation over your usual time-slice) differences from the server snapshot. That PVS is why you'll see map hacks where people can see through walls and whatnot. The server is doing less expensive checks(not doing a ray cast per-client to client which is n^2) and the cheat takes advantage of that data in memory.