This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
it is possible but problem is that you run two different applications and every in it's own JVM instance!!! So classical singleto pattern wouldnot work. You should try to find some pattern which is "network aware". Think I saw some article on this a month ago at http://www.theserverside.com