In addition to gif images and vrml worlds, dx objects can now be transfered into a web page through Java Explorer. This feature uses an ActiveX component in the web page and therefore works in Internet Explorer and not in Netscape. The ActiveX component uses a copy of Data Explorer installed on the machine which runs the browser in order to render its image. This also requires adding tear.exe to your path.
The net files you save for use with DXServer, have always used a special version of the Image macro. Now, the macro uses an internal cache setting of CACHE_LAST which should save memory.
DX*htmlDir: /usr/http/java
A value is required for cosmoDir only if you're generating web pages which use vrml. The files pointed to by cosmoDir are supplied with the cosmo plug-in.
This location depends on your installation of java.