I sort of get why it's used, but what puzzles me is how it functions in certain situations. For example, when linking a contact with an account, it is what is responsible for the calculation to add the coloring and underline to the "Company" label. The field is a calculation with a "1" in it . . . I've walked through the linking process and can't find a single reference to how this field is set to empty . . .
I also understand that this solution is provided for free and that a question such as this might be better received if I'm a paying customer of the training, but, I'm from the camp of "If you never ask, you'll never know the answer", so I thought I'd give it a go!!!