nts­faq – Fre­quently an­swered ques­tions about TeX ex­ten­sion

Th­ese an­swers come from the NTS-L mail­ing list. The an­swer deal with many de­tails of the e-TeX TeX ex­ten­sion and the pro­posed New Type­set­ting Sys­tem, of which a first base pro­to­type sys­tem has now been re­leased.
The an­swers also cover ex­ten­sions to re­lated sys­tems, and sum­maries of pre-ex­ist­ing ex­ten­sions.