orm better or are more clearly described
if written in C or other languages rather than in EusLisp.
EusLisp provides the way to link programs coded in C.

<P>
If you want to define EusLisp function written in C,
each EusLisp-callable C-function must be coded to accept three arguments:
the context pointer, the number of arguments and the pointer to the Lisp
argument block.
These arguments must be named as <TT>ctx, n</TT> and <TT>argv</TT>,
since the macros in <TT>c/eus.h</TT> assume these names.
The C progra