Mouse position in DirectX

Hi

I am working with DirectX and have a question about how to get feedback about where the mouse is. I am working with C# but I would guess what I am looking for is pretty universal. My problem is this. If I create a line and render it to my device and rotate and scale, If I then move the mouse to the endpoint I would like to get the correct cordinate for the endpoint of that line. I probably could do alot of math but is there anything within DirectX I can use to get a translatet mouse position that reflect the Device. MM It doesn't make sense to me either..Ok lets make another example. Lets say I design a game that have something happening when the user is clicking on X200,Y200,Z50..Lets then say that the user can rotate the enviorment. How can I find out what coordinate he clickt after the transformation. Is there a function to get the projected position of my 3D Model

~Barjor

Think I got it but is there an easier way to do it

http://msdn.microsoft.com/library/de...s/cpp/pick.asp