> Meer, Hans van der <mailto:H.vanderMeer@uva.nl>
> 22. Mai 2016 um 17:40
>
> It is not clear as yet.
> \starttext
> \input knuth
> \page[header,yes]
> \input knuth
> \page[header,yes]
> \input knuth
> \stoptext
> Here I get three pages, the first two without the last with header. 
> That I understand.
>
> \starttext
> \input knuth
> \page[header]
> \page
> \input knuth
> \stoptext
> Both pages keep their header.
>
> \starttext
> \input knuth
> \page
> \page[header]
> \input knuth
> \stoptext
> Both pages keep their header.
>
> Should I conclude that the state change occurs if and onlyif when in 
> the same macrocall a real pagebreak is realize?
> Because otherwise I do not observe a state change.
Change the order of the keywords (yes before header).

The header and footer keywords can be used when you want to hide header 
and footer texts
on empty left pages before a chapter etc. in a doublesided document.

\setuppagenumbering[alternative=doublesided]
\setuphead[chapter][page={yes,header,right}]
\starttext
\chapter{First chapter}
\chapter{Second chapter}
\stoptext

Wolfgang