.IB an ,
.B ...);
.PP
+or a standard message which takes keyword arguments,
+defined as
+.IP
+.I tr
+.IB m ( \c
+.I t1
+.IB a1 ,
+.RB ... ,
+.I tn
+.IB an ?\&
+.IR tn +1
+.IR kn +1
+.RB [ =
+.IR dn +1] \c
+.B ,
+.I tm
+.I km
+.RB [ =
+.IR dm ] \c
+);
+.PP
two entry points are defined:
the usual `main' entry point
which accepts a variable number of
and a `valist' entry point
which accepts an argument of type
.B va_list
-in place of the variable portion of the argument list.
+in place of the variable portion of the argument list
+or keywords.
.IP
.I tr
.BI (* m )( \c
If
.I m
takes a variable number of arguments,
+or keyword arguments,
the macro is more complicated
and is only available in compilers advertising C99 support,
but the effect is the same.