[xmonad] managehook: How to shift apps to a screen in dual-head?

[mito]

Hi all!

I got a proper dual-head xrandr configuration with one monitor in 
landscape view and one in portrait view. So in xmonad I have 2x10 
workspaces, which is fine.

Sure I can manually navigate and switch the focus or push clients to a 
specific monitor/screen by mod+{w,e} etc., no problem. – But how to 
initially shift programs to workspaces on a specific monitor (in 
myManageHook)?

Cheers