[xfce] Dual screen - define which window to open documents

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http://ubuntuforums.org – Hi I run UBUNTU with xfce wm. By using xrandr i could define and setup the two screens. On one screen I have the main XFCE desktop with icons and toolbars etc. On the aother I am running a citrix session via remmina remote desktop client.This session is toggled into fullscreen. Problem is that when I am trying to open a file, word document, locally the document will open on the second screen behind the citrix session. To see it I need to toggle fullscreen off to be able to move the document back to the other screen. How can I define whicj screen should be default screen to open u (Hardware)