|0x1||1||JK will render through the adjoin.|
|0x2||2||Adjoin allows things to cross through it.|
|0x10||16||Adjoin does not allow players to cross through it.|
|0x20||32||Rendering through the adjoin has been disabled by SetSectorAdjoins().|
|0x80||128||Unknown. All adjoins are given this flag on startup.|
Surface Adjoin Flags control special surfaces that connect two adjoining sectors. With the proper flags, things can pass through the surface into the opposing sector, and you can see from one sector into the other.