ariable, scalar variable, directory, file, widget,
and executable. Used by procedures <code>dump</code> and
<code>which</code>.</dd>

<dt><b>which</b> <i>command</i></dt>

<dd>Like the 'which' command of Unix shells, this will tell you if
a particular command is known, and if so, whether it is internal or
external to the interpreter. If it is an internal command and there
is a slot in auto_index for it, it tells you the file that
auto_index would load. This does not necessarily mean that that is
where the f