Fabrice,
there is difference between putting something on the first page
regardless of the number of pages in your document or do something when
your document contains only a single or more pages.
When you have a header or title which is always placed on the first page
(but not on the following pages) you have to options.
1. Check the current page when to header is placed which can be
done with \doif{\pagenumber}{1}{...}
2. Disable the header on the first page (\setupheader[state=high])
and place your own title as a regular element in the running text.
A case where you have to number the number of total pages is when you
try to show the page counter in the form "Page x of y" for 2 or more
pages. In this case you have to check against the value for the total
number of pages which can be done with
\doifnot{\totalnumberofpages}{1}{...}.
Below are two examples which show how the header/title placement works.
%%%% start example 1
\startsetups [header]
\startframed [width=max,height=max]
First page header
\stopframed
\stopsetups
\startsetups [footer]
Page \userpagenumber\ of \lastuserpagenumber
\stopsetups
\setupheadertexts
[\doif{\pagenumber}{1}{\directsetup{header}}]
\setupfootertexts
[\doifnot{\totalnumberofpages}{1}{\directsetup{footer}}]
\starttext
\dorecurse{12}{\samplefile{lorem}\par}
\stoptext
%%%% stop example 1
%%%% start example 2
\startsetups [header]
\setupheader[state=high]
\startframed [width=max,height=3cm]
First page header
\stopframed
\blank
\stopsetups
\startsetups [footer]
Page \userpagenumber\ of \lastuserpagenumber
\stopsetups
\setuppagenumbering
[location=none]
\setupfootertexts
[\doifnot{\totalnumberofpages}{1}{\directsetup{footer}}]
\starttext
\setup[header]
\dorecurse{12}{\samplefile{lorem}\par}
\stoptext
%%%% stop example 2
Wolfgang
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