% example by Andreas Harder

\definefontfeature[default][default][mode=node,onum=yes]
\definefontfeature[sc]     [default][smcp=yes]

\def\sc{\groupedcommand{\setfontfeature{sc}}{}}

\setupbodyfont[palatino]

\starttext

    \startTEXpage[offset=1ex]      {\sc Abc} 0369 \par      \sc{Abc} 0369 \stopTEXpage
    \startTEXpage[offset=1ex] 0369 {\sc Abc} 0369 \par 0369 \sc{Abc} 0369 \stopTEXpage

\stoptext
