It is not possible to bring up a second AAI dashboard from a different AAI system. When you click on the jnlp. the login page will now show up.
Release : 6.3.0
Component : AUTOMIC AUTOMATION INTELLIGENCE ENGINE
N/A
In order to launch two AAI thick client instances for different AAI servers, each server must have a unique server ID specified during installation or via the AAI configuration tool parameter, client.jawsServerId as documented here.