This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Though I have yet to venture down that path, it is possible to set up your web apps (contexts) such that they can make cross-context calls to each other. They have to be set up this way (there's an attribute on the context attribute of Tomcat's server.xml that enables this -- not sure how other servers may operate). Sorry I couldn't give you more specifics. But perhaps this is enough to get you researching down the correct path -- or others that have actually done this could chime in. Another possibility is to step out of the servlet mechanisms and use RMI or other comm mechanisms. [ February 09, 2004: Message edited by: Bear Bibeault ]