Taboo??

This question comes after a search at the Novell/SuSE web site for the term "Taboo" There is nothing in the instructions on installation on this subject. I was installing 9.2 and just got to Detailed Selection, selecting applications etc. I got a notice that Taboo selection X11 is required by OT.. KDE Desktop requires X11 ... One of the alternatives was not to "set X11 to Taboo" What does all that mean? What is involved in (not) setting X11 to Taboo? Thanks