Hi,

Does something like \newcommand exist in ConTeXt? 
My questions aims especially at the optional argument
with a predefined value.  So, how do I realize 

\newcommand{\test}[2][A]{foo}

with ConTeXt. In the fine manual I found an index entry
\definecommand, but in the 'rest' of the manual it was
never mentioned (print and screen version alike)!

Regards,

Juergen