Thank you, Mark, for such a complete and clear answer. You are a big help to 
me. What you said agrees and helps me understand what I have read. What I was 
concerned about was my Execute Blocks were too big, and had to be split into 
several smaller blocks. I wanted to make sure all the blocks were executed as a 
single transaction to keep other users from interleaving their updates. You 
have answered that question quite nicely. Thanks again.

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