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diff --git a/tex/context/base/typo-inj.mkiv b/tex/context/base/typo-inj.mkiv
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+%D \module
+%D   [       file=typo-inj,
+%D        version=2014.10.13,
+%D          title=\CONTEXT\ Typesetting Macros,
+%D       subtitle=Triggering Actions,
+%D         author=Hans Hagen,
+%D           date=\currentdate,
+%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
+%C
+%C This module is part of the \CONTEXT\ macro||package and is
+%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
+%C details.
+
+\writestatus{loading}{ConTeXt Typesetting Macros / Triggering Actions}
+
+%D This is a sort of escape from too automatic typesetting of lists. I have
+%D been thinking fo a more generic injector for instance based on tags (as we
+%D already index each element) but thi sis sort of fuzzy because the number of a
+%D tag is not always incremented before we check for it. Also, registers and lists
+%D are among the few candidates that cannot be controlled directly by putting
+%D something in the input. So,m for the moment I stick to this mechanism but
+%D future versions of \CONTEXT\ might do it differently. Compatibility is not much
+%D of an issue here as this mechanism is only to be used in final production runs.
+
+\unprotect
+
+\registerctxluafile{typo-inj}{1.001}
+
+% todo: no need in trialmode
+
+%D \showinjector
+%D
+%D \setinjector[register][3][\column]
+%D \setinjector[list]    [2][{\blank[3*big]}]
+%D
+%D \starttext
+%D     \placelist[section][criterium=text]
+%D     \blank[3*big]
+%D     \placeregister[index][criterium=text]
+%D     \page
+%D     \startsection[title=Alpha] first  \index{first}  \stopsection
+%D     \startsection[title=Beta]  second \index{second} \stopsection
+%D     \startsection[title=Gamma] third  \index{third}  \stopsection
+%D     \startsection[title=Delta] fourth \index{fourth} \stopsection
+%D \stoptext
+
+\unexpanded\def\resetinjector              [#1]{\clf_resetinjector{#1}}
+\unexpanded\def\markinjector               [#1]{\dontleavehmode\clf_markinjector{#1}}
+\unexpanded\def\checkinjector              [#1]{\clf_checkinjector{#1}}
+\unexpanded\def\checknextinjector              {\clf_checknextinjector}
+\unexpanded\def\checkpreviousinjector          {\clf_checkpreviousinjector}
+\unexpanded\def\dosetinjector      [#1][#2][#3]{\clf_setinjector{#1}{#2}{#3}}
+\unexpanded\def\doshowinjector             [#1]{\clf_showinjector{#1}}
+
+\unexpanded\def\setinjector {\dotripleargument\dosetinjector}
+\unexpanded\def\showinjector{\dosingleempty\doshowinjector}
+
+\unexpanded\def\domarkinjector#1#2% called at the lua end
+  {\dontleavehmode\llap{\infofont\ifcase#1\else\red\fi<#2>\quad}}
+
+% low level definers .. we could have \injectors_mark and \injectors_check and then
+% use \v!list instead of \s!list
+
+\unexpanded\def\doinstallinjector#1%
+  {\letvalue{typo_injectors_mark_#1}\donothing
+   \letvalue{typo_injectors_check_#1}\donothing}
+
+\unexpanded\def\doactivateinjector#1% used at lua end
+  {\setuxvalue{typo_injectors_mark_#1}{\dontleavehmode\noexpand\clf_markinjector{#1}}%
+   \setuxvalue{typo_injectors_check_#1}{\noexpand\clf_checkinjector{#1}}}
+
+\unexpanded\def\dotestinjector#1%  only for testing outside unprotect
+  {\csname typo_injectors_check_#1\endcsname
+   \csname typo_injectors_mark_#1\endcsname}
+
+\protect \endinput
+