Pre-requisite sorting in research.

Can someone explain what pre-requisite sorting means in research window? Pre-requisite to what?
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I think this refers to techs that must be researched to open new paths to more advanced techs. I have been grouping them by type, so have not really used it this way , but that's my guess. ;p

You might want to check out the PDF tech tree on JavaScout's site (huge help):

http://webpages.charter.net/trevorpowdrell/