This example expands on the tank example from the Parameterized Popup Window and UDTs page.
Opening a window will only ever open one copy of any given window. If a popup window is already open, it simply brings it to the front. Sometimes you may want to open a separate popup, one for Tank 100, and one for Tank 101, both at the same time. If this is the case, you can use the system.nav.openWindowInstance function call to open your window.