### - o -

- OffsetGroundSprite() : viewport.cpp , viewport_func.h
- OppositeCorner() : slope_func.h
- OrderClick_Delete() : order_gui.cpp
- OrderClick_FullLoad() : order_gui.cpp
- OrderClick_Goto() : order_gui.cpp
- OrderClick_Nonstop() : order_gui.cpp
- OrderClick_Refit() : order_gui.cpp
- OrderClick_Skip() : order_gui.cpp
- OrderClick_Transfer() : order_gui.cpp
- OrderClick_Unload() : order_gui.cpp
- OrderGetSel() : order_gui.cpp
- OtherAxis() : direction_func.h
- OTTD2FS() : stdafx.h , win32.cpp
- OTTD_SendThreadMessage() : openttd.h , openttd.cpp
- OTTDSHGetFolderPath() : win32.h , win32.cpp