Invoke KeyDown on WPF Control?

I have two entire开发者_如何转开发ly uncoupled WPF windows, however, if something particular is happening in window 1, I do want to invoke or 'simulate' a Key.Up/.Down on a control on the 2nd window. Is that possible?

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Are they sharing an application? If they do, you should be able to call BeginInvoke on the control's event handler

But why to simulate a key press when you can just call a function?