A custom built application's code is written to display two MS Word 2003
documents on a single screen by splitting the screen horizontally into two.
One document is to appear on the top half of the screen, while the other
document is to open up on the bottom half.
Instead, we find that the Word documents open up on the full screen, one
behind the other.

Strangely, the same code/application works exactly as intended on a
different PC having supposedly similar environment ( Windows XP/ Office 2003)
Are there any settings that control this? What could be causing the code to
behave different on the two machines running Office 2003 and XP?

Code used for the purpose is given below.

With mvarobjword.MSWord
       
       For intCount = 1 To .Windows.Count
       
           If InStr(1, .Windows(intCount).Caption, mvarTest, vbTextCompare)
<> 0 _
           And mvarTest<> "" Then
               With .Windows(intCount)
                   .WindowState = wdWindowStateNormal
                   .Height = Screen.Height / 20 / 2
                   .Width = Screen.Width / 20
                   If blnTop = False Then
                       .Top = 0
                   Else
                       .Top = Screen.Height / 20 / 2
                   End If
                   .Left = 0
                   blnTop = True
               End With
           End If
           
           If InStr(1, .Windows(intCount).Caption, mvartest1,
vbTextCompare) <> 0 _
           And mvarTest1<> "" Then
               With .Windows(intCount)
                   .WindowState = wdWindowStateNormal
                   .Height = Screen.Height / 20 / 2
                   .Width = Screen.Width / 20
                   If blnBottom = False Then
                       .Top = Screen.Height / 20 / 2
                   Else
                       .Top = 0
                   End If
                   .Left = 0
                   blnBottom = True
               End With
           End If
           
       Next
       
   End With