AS3.0 and Screen Extension to a second screen

Dear Friends
I need help for an outsourced project,
I have an application that runs on a PC and tis connected to a videowall,
what the developer has to do in order to have the operator console shown on the operator pc while the extension (HDMI connection) shows only the end results without the operator selections
the developer does not know how to do the screen extension , Any hints?
