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You can test for a running instance of Word by using the GetObject function.

VB Code:
  1. Option Explicit
  2. 'Add a reference to MS Word xx.0 Object Library
  3. Private Sub Command1_Click()
  4.     Dim oApp As Word.Application    
  5.     Set oApp = GetObject(, "Word.Application)
  6.     If TypeName(oApp) <> "Nothing" Then
  7.         'A Word instance is running
  8.     Else
  9.         'No Word instances running.
  10.     End If
  11.     '...
  12.     '...
  13. End Sub