Opening a stack *behind* another stack?

[Cubist at aol.com]

sez doug at webcrossing.com:
>If I open a stack it always appears at the selected, topmost stack. But what
>if I want to open it up *behind* another stack. For example, after opening
>it up I might want it to slide out from behind another stack.
>How would I specify that the newly opened stack is behind another stack?
   I'm not entirely sure why you'dFake it. 

  lock screen
  open stack "Fred"