Use this toOpen a new internal browser window.
Menu pathView > Preview > New Browser Window
Command nameMToolsBrowserNew
Accelerator keyN (from the main menu: Alt+V > I > N)
Options on parent menu (Preview+)Preview Tab, Active Preview, Active Preview Window (classic mode), Preview in Browser Window, Preview Server-Side Script, Preview through PHP Interpreter, Preview with Remote Files, Default Browser Window, New Browser Window