search of a huge UNIX system directory, a two-level scheme
is used: <B>/c/name</B> where <I>name</I> is the name of the terminal,
and <I>c</I> is the first character of <I>name</I>. Thus, <I>act4</I> can be
search of a huge UNIX system directory, a two-level scheme
is used: <B>/c/name</B> where <I>name</I> is the name of the terminal,
and <I>c</I> is the first character of <I>name</I>. Thus, <I>act4</I> can be