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.