Your problem with installing multiple java instances on the same box is going to be how the app looks at which java version is the latest. True you can install different copies of JVM and they all end up in their own directories - but the default copy of java that's run from the browser can be a b*gger to manage: especially if you've different apps wanting different versions. I've used Citrix's app streaming to deliver different java versions to the users - and that sits on top of AIE. App Streaming is more complex to setup sure - might be more straightforward to just use AIE for a couple of servers. Remember you can't install an AIE app via an RDP connection. From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Angela Smith Sent: 07 April 2010 01:59 To: thin@xxxxxxxxxxxxx Subject: [THIN] Installing an older JVM Hi My citrix Servers are running Java Ver 1.60_14. I have an application that requires JVM 1.42. Whats the best way to address this? Can I simply install 1.42 or will that beak 1.60? Should I uninstall 1.60, install 1.42 then install 1.60? Alternatively I can try AIE but I have never done this. Any tips or articles on virtualising JVM? Thanks Ang _____ Find it on Domain.com.au Need a new place to live? <http://clk.atdmt.com/NMN/go/157631292/direct/01/>