<s>
Hemlock	B-Application
is	O
a	O
free	B-Application
Emacs	B-Application
text	B-Application
editor	I-Application
for	O
most	O
POSIX-compliant	O
Unix	B-Application
systems	I-Application
.	O
</s>
<s>
It	O
follows	O
the	O
tradition	O
of	O
the	O
Lisp	B-Operating_System
Machine	I-Operating_System
editor	O
ZWEI	B-Operating_System
and	O
the	O
ITS/TOPS	O
-20	O
implementation	O
of	O
Emacs	B-Application
,	O
but	O
differs	O
from	O
XEmacs	B-Language
or	O
GNU	B-Application
Emacs	I-Application
,	O
the	O
most	O
popular	O
Emacs	B-Application
variants	O
,	O
in	O
that	O
it	O
is	O
written	O
in	O
Common	B-Language
Lisp	I-Language
rather	O
than	O
Emacs	B-Operating_System
Lisp	I-Operating_System
and	O
C	B-Language
—	O
although	O
it	O
borrows	O
features	O
from	O
the	O
later	O
editors	O
.	O
</s>
<s>
Hemlock	B-Application
was	O
originally	O
written	O
by	O
the	O
CMU	O
Spice	O
project	O
in	O
Spice	B-Language
Lisp	I-Language
(	O
later	O
renamed	O
to	O
CMU	B-Language
Common	I-Language
Lisp	I-Language
)	O
for	O
the	O
PERQ	B-Device
computer	O
.	O
</s>
<s>
Hemlock	B-Application
is	O
integrated	O
with	O
the	O
Common	B-Language
Lisp	I-Language
compiler	O
,	O
interpreter	O
,	O
and	O
development	O
suite	O
CMU	B-Language
Common	I-Language
Lisp	I-Language
,	O
though	O
it	O
is	O
possible	O
to	O
use	O
it	O
as	O
a	O
standalone	O
editor	O
,	O
or	O
to	O
use	O
GNU	B-Application
Emacs	I-Application
with	O
CMUCL	B-Language
instead	O
—	O
Hemlock	B-Application
integrates	O
better	O
,	O
but	O
has	O
fewer	O
features	O
and	O
addon	O
programs	O
.	O
</s>
<s>
One	O
distinctive	O
feature	O
is	O
that	O
Hemlock	B-Application
distinguishes	O
Lisp	O
function	O
names	O
from	O
interactive	O
command	O
names	O
,	O
which	O
are	O
given	O
in	O
a	O
more	O
natural-language-like	O
style	O
derived	O
from	O
the	O
original	O
MIT	O
Lisp	B-Operating_System
Machine	I-Operating_System
editor	O
Zmacs	B-Operating_System
and	O
TECO	B-Application
Emacs	B-Application
.	O
</s>
<s>
It	O
is	O
able	O
to	O
display	O
to	O
a	O
terminal	B-General_Concept
,	O
or	O
use	O
the	O
CLX	B-Language
(	O
Common	B-Language
Lisp	I-Language
X	B-Operating_System
Library	O
)	O
for	O
X11	B-Operating_System
.	O
</s>
<s>
Other	O
variants	O
of	O
Hemlock	B-Application
:	O
</s>
<s>
Clozure	B-Application
CL	I-Application
's	O
Macintosh	O
integrated	O
development	O
environment	O
has	O
an	O
editor	O
,	O
which	O
is	O
based	O
on	O
Hemlock	B-Application
code	O
and	O
uses	O
Apple	O
's	O
Cocoa	O
for	O
display	O
.	O
</s>
<s>
The	O
editor	O
of	O
LispWorks	B-Language
is	O
based	O
on	O
an	O
early	O
version	O
of	O
Hemlock	B-Application
.	O
</s>
<s>
This	O
version	O
is	O
portable	O
and	O
runs	O
on	O
Windows	O
,	O
Mac	O
OS	O
X	B-Operating_System
,	O
X11/Motif	O
and	O
Gtk+	O
.	O
</s>
<s>
The	O
editor	O
not	O
only	O
runs	O
in	O
LispWorks	B-Language
,	O
but	O
also	O
in	O
Liquid	O
Common	B-Language
Lisp	I-Language
.	O
</s>
<s>
Lucid	B-Language
Common	I-Language
Lisp	I-Language
provided	O
an	O
editor	O
called	O
Helix	O
,	O
which	O
was	O
based	O
on	O
Hemlock	B-Application
.	O
</s>
<s>
Portable	O
Hemlock	B-Application
is	O
a	O
variant	O
of	O
Hemlock	B-Application
running	O
on	O
multiple	O
versions	O
of	O
Common	B-Language
Lisp	I-Language
.	O
</s>
