Question: DIfficulty with outputting answers using ; and :

I have a large program I have been writing using Maple 10 classic. The heart of the prgram is a large iterative loop that spits out various data as it converges on a solution. My problem is that I would like to see certain data and suppress other output. I accordingly assign a colon and semi-colon to the respective lines. But wether Maple actually displays what I want of not seems random. The screen is flooded with unwanted interim data, and only select desired output gets through. Is there some rule with what Maple outputs if its in an iterative or nested iterative loop?
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