Running this-command in another window

[Lennart Borgman (gmail)]

I am trying to run the current command in another window than the window 
it was issued in. I do something like this in pre-command-hook:

   (select-window my-desired-window)

This actually seems to do what I want most of the times, but when the 
command has something like

  (interactive "sRegexp\nP")

the regexp can't be read. The prompt is shown, but the input goes to the 
buffer in my-desired-window.

Is there any way to do what I want to do, ie run the command in 
my-desired-window?