Screenshot of a section of the Explorer window, runtime tab, showing the Server Registry Node and its default subnodes. Server Registry node has the following default nodes. Default Servers, showing that the default server for J2EE applications is RI Instance 1, and Web Tier Applications, showing that the default server for these applications is Tomcat 4.0. The Installed Servers (subnode of Server Registry) has nodes for Tomcat 4.0 and J2EE Reference Implementation 1.3.1. The J2EE Reference Implementation 1.3.1 node has subnode for an instance of this server, name RI Instance 1.