TEX s includes the string s, presumably containing TeX commands, in the TeX version of the documentation containing this hypertext item. The main benefit of this is that in the HTML and TeX versions of the documentation, good typesetting can done. For details on the conversions to HTML that are currently implemented, see html(TEX).
This item should be used only within a paragraph created by PARA, because in the html code it generates, the first element ends the enclosign paragraph to create the centered math display.
The object TEX is a mark-up type, with ancestor classes Hypertext < BasicList < Thing.