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Very hard to help without a workbook, John.
In principle, you'd want a couple of calculated fields to set color and label text. You'd have to a mechanism to tie the logged in user's Tableau ID to a specific subset of the data, though, so that you can determine what to do if the username matches the data. Can you build a relationship somehow between the data behind each line and a set of users?
I don't think it's impossible, but hard to give you much guidance without knowing what your data looks like.
Yes we will have be adding the user ids to the data before it get's imported into tableau - so confident we will have a link to work with.
Point taken about no workbook