Here is a good document about using the Veritool and Vaidation.
http://forums.ni.com/ni/board/message?board.id=170&message.id=209519
You might have already seen this.
Keep in mind that Veritool is for use in 7.1 or previous. In order to use it for 8. refer to this posting.
http://forums.ni.com/ni/board/message?board.id=170&message.id=214169#M214169
Hope this helps,
Rick Kuhlman