James, Jerry,
these settings are stored in registry: HKEY_CURRENT_USER\Software\ESRI\Explorer1700\ArcGlobe\Settings
Elevation - "Max. Elevation Memory in Mb"
Point features - "Max. Point Memory in Mb"
Line features - "Max. Line Memory in Mb"
Text - "Max. Text Memory in Mb"
3D object (geometry) - "Max. Multipatch Memory in Mb"
3D object (texture) - "Max. Vector Texture Memory in Mb"
Image/rasterized - "Max. Raster Texture Memory in Mb"