java policy in oracle application server

Hello everybody ,
Well Iam working on an application where I have developed a Applet-RMI communication, where applet is a signed applet,and I modify java policy file on my system so ts working fine but I want to know in oracle application server as when application is installed and applet is a signed applet and its working perfectly without modifying the policyfile of oracle appliaction server and how come this.Well can anybody tell me about this as I want to test the policy file in oracle application server to get exception if the rights are there for this applet.

Thanks