\starttext

\definelow       [MyLow]   [style=\txx]
\definehigh      [MyHigh]  [style=\txx]
\definelowhigh   [MyLoHi]  [style=\txx]
\definelowmidhigh[MyLoMiHi][style=\txx]

We have
    \ruledhbox{\low         {L}} and \ruledhbox{\MyLow         {L}} and
    \ruledhbox{\high        {H}} and \ruledhbox{\MyHigh        {H}} and
    \ruledhbox{\lohi     {L}{H}} and \ruledhbox{\MyLoHi     {L}{H}} and
    \ruledhbox{\lomihi{L}{M}{H}} and \ruledhbox{\MyLoMiHi{L}{M}{H}}.

\stoptext
