Currently those names are not very practical.

Information

D2RoomExStrc holds pretty much all the static data, and is always kept in memory until level is destroyed
- Tiles
- Preset units (Objects)
- Links to nearby rooms
- Pointer to D2RoomStrc
D2RoomStrc contains mostly dynamic data / temporary data, and can be streamed in/out (see https://github.com/ThePhrozenKeep/D2MOO/blob/master/source/D2Common/src/Drlg/DrlgActivate.cpp#L90 and https://github.com/ThePhrozenKeep/D2MOO/blob/master/source/D2Game/src/GAME/Game.cpp#L2081)
- Units lists
- Dynamic collision grid (only affected by dynamic units)
- List of clients
- ...

Possible names

For D2RoomExStrc:

D2RoomStrc
- Could cause confusion with previous names
- Probably the name used by the original code since an assert string gave the following: !DrlgTestClient (DrlgRoomGetDrlg (ptRoom)), and Drlg is the prefix for all functions related to DRLG.
D2DrlgRoomStrc
D2StaticRoomStrc
?

For D2RoomStrc: