What is the "Get" counterpart the DoCmd.MoveSize command?

In other words, how do I find the size of the current window and get it in Twips so I can do some calculations on it...?

I can get the current maximum size by using an API call....

Declare Function GetWindowRect Lib "user32" (ByVal hwnd As Long, lpRect As Rect) As Long

....but I don't know what format this number is in, like Twips or pixels or what, so I can't really use it. I'm wondering if there is some conver