Paragraph Enumeration

\newcounter\Paracount
\setcounter\Paracount1

\def\Paragraphnumber%
   {\increment\Paracount 
    \Paracount.~}

\def\startParagraphs%
   {\par \begingroup \appendtoks \Paragraphnumber \to \everypar}

\def\stopParagraphs%
   {\par \endgroup}

\starttext

Unnumbered text before.

\startParagraphs
This is the first numbered paragraph.

This is another paragraph. This is another
paragraph. This is another paragraph.
\stopParagraphs

Unnambered text after.
\stoptext