Hi,

how to display the first and last section name at the beginning of
each chapter?

I'm a little clueless which mechanism to use. A local table of
contents displays all sections. Marks maybe? Although I have no idea
how to achieve that with marks. Sure, I could manually reference the
sections and use \about, but this is error prone especially for the
last section/chapter. Example:

\starttext
First chapter:  %% Foo
Last chapter:   %% Bar

\startchapter [title=Foo]
  First section:  %% Alpha
  Last section:   %% Gamma

  \section{Alpha} \input knuth \page
  \section{Beta}  \input knuth \page
  \section{Gamma} \input knuth \page
\stopchapter

\startchapter [title=Bar]
  First section:  %% Monday
  Last section:   %% Wednesday

  \section{Monday}    \input knuth \page
  \section{Tuesday}   \input knuth \page
  \section{Wednesday} \input knuth \page
\stopchapter

\stoptext

Marco