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Hello, In the example below... ---------------------------------------------------- %\def\myCommand#1#2{} \def\myCommand#1#2{#1 #2} %\def\myCommand{} \setuphead[chapter] [number=yes, align=middle, % anyotherparameter=whatever, command=\myCommand] % command=] \starttext \startfrontmatter %\placecontent \completecontent \stopfrontmatter \startbodymatter \chapter{chapter one} \dorecurse{5}{\input tufte\par} \chapter{chapter two} \dorecurse{5}{\input douglas\par} \stopbodymatter \stoptext ---------------------------------------------------- ... how do you define myCommand so \setuphead[chapter] [(any other parameter settings), command=\myCommand, (any other parameter settings)] is equal to \setuphead[chapter] [(any other parameter settings), command=, (any other parameter settings)] i.e. with any other parameter settings remaining active. In the example above, with align=middle and - \def\myCommand#1#2{} the ToC and chapter heads are blank - \def\myCommand#1#2{#1 #2} the ToC and chapter head alignment is lost - \def\myCommand{} the ToC and chapter head alignment is lost Thanks, Alan