Sun Microsystems Inc and Netscape Communications Corp have extended their 1994 Internet security co-development agreement. Sun will begin selling all four versions of the Netscape Server for Web sites and bunding the technology with its Netra servers. There are no results from their joint security work yet, but on May 23, on the first day of SunWorld, Sun promises to detail a slew of packaging, pricing and development arrangements for all of its World Wide Web technologies. By then it is expected to have ready plans for Java, its Web development language. In the run-up, it is trying to persuade the browser houses to adopt Java – currently deployed in its experimental HotJava interface. Sun estimates that Netscape holds around 80% of the market. It says it requires agreement across the board to support Java, to prevent fragmentation and incompatibility around the Web. It has not said how far it has got.