The language reference does not give any information on using Screen(0) as 
opposed to Screen(any integer).  Is there some documentation on what effect 
non-zero numbers have on the function?


> 1. Is this the best way to position a window when it is shown?
> =================================================
> Declare Function GetSystemMetrics Lib "user32.dll" (ByVal      > nIndex As 
> Integer) As Integer
>
> 'Returns screen width in pixels
> intScreenWidth = GetSystemMetrics(0)
>
> 'Returns screen height in pixes
> intScreenHeight = GetSystemMetrics(1)
>
> Main.Left = (intScreenWidth - Main.Width)/2
> Main.Top = (intScreenHeight - Main.Height)/2
> =================================================

The above code is not cross-platform compatible. While there are
good reason to use OS-specific declares like this, in this particular case it 
is not necessary. You can use the Screen class to get info like Width, Height, 
Depth and more; and for all of the monitors connected to the computer (see 
ScreenCount function).

Your code rewritten with the Screen class would be:

Main.Left = (Screen(0).Width - Main.Width) / 2
Main.Top = (Screen(0).Height - Main.Height) / 2

Another option is to use the AvailableWidth and other functions to position 
windows outside of the areas occupied by: TaskBar, MenuBar and the Dock in OS X.

> 2. Where is the best place to put window positioning code? I   > tried 
> placing it the window's open event or is there a better  > place for it?

Window.Open event is fine... and will position the Window before it is 
displayed on the screen. Of course you can change the Window properties at any 
time, such as making the Window smaller when the user chooses to hide certain 
UI elements.


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