To print LuajitTeX when used, one can define the following command:
<context mode=mkiv source=yes text=produces>
% engine=luajittex
\def\texjitenginename{\ctxlua{if (texenginename == LuaTeX and jit ~= nil) then context("LuajitTeX") else context.texenginename() end }}
\texjitenginename
</context>
* {{cmd|texenginename}} gives the name of the engine (e.g. LuaTeX, or XeTeX).
* {{cmd|texengineversion}} gives the version number of the engine (e.g. 0.64).
* {{cmd|contextversion}} gives the timestamp of the ConTeXt version in use (as a timestamp)* {{cmd|contextmark}} gives MKII or MKIV, the ConTeXt major release marker* {{cmd|contextversionnumber}} gives the ConTeXt version followed by the mark.