--- a/openttd.h	Sat Aug 26 16:46:32 2006 +0000
+++ b/openttd.h	Sat Aug 26 17:12:24 2006 +0000
@@ -42,7 +42,7 @@
 typedef uint16 DepotID;
 typedef uint16 WaypointID;
 typedef byte PlayerID;
-typedef byte OrderID;
+typedef byte VehicleOrderID;  ///< The index of an order within its current vehicle (not pool related)
 typedef byte CargoID;
 typedef byte LandscapeID;
 typedef uint16 StringID;