From NWN Lexicon
Returns the next area in the module.
Returns the next area in the module (after GetFirstArea), or OBJECT_INVALID if no more areas are loaded.
This function was added in 1.74.8149 of NWN:EE.
Note that the description of this function was omitted from the PDF release notes. The function is described in a readme in the lang/<language>/docs directory delivered with Neverwinter Nights Enhanced Edition, and in the toolset script editor.