The program changes a little each year. I have found in my time here that things are usually changed because the programmer was given another limiter. I don't know what changed or why. Just that they do and there is always a really good reason, when I get to find out.
Since you said desktop, I knew you were in good shape. It also means that you are more aware of the program and how things work together.
The programmers don't share the millions of needed changes or the reasons with us. Some of the big ones get shared and they are always interesting.
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