<s>
In	O
computing	O
,	O
CLISP	B-Application
is	O
an	O
implementation	O
of	O
the	O
programming	O
language	O
Common	B-Language
Lisp	I-Language
originally	O
developed	O
by	O
Bruno	O
Haible	O
and	O
Michael	O
Stoll	O
for	O
the	O
Atari	B-Device
ST	I-Device
.	O
Today	O
it	O
supports	O
the	O
Unix	B-Application
and	O
Microsoft	B-Application
Windows	I-Application
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
CLISP	B-Application
includes	O
an	O
interpreter	B-Application
,	O
a	O
bytecode	O
compiler	B-Language
,	O
debugger	B-Application
,	O
socket	B-Protocol
interface	O
,	O
high-level	O
foreign	O
language	O
interface	O
,	O
strong	O
internationalization	B-General_Concept
support	O
,	O
and	O
two	O
object	B-Language
systems	I-Language
:	O
Common	B-Application
Lisp	I-Application
Object	I-Application
System	I-Application
(	O
CLOS	B-Application
)	O
and	O
metaobject	O
protocol	O
(	O
MOP	O
)	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
C	B-Language
and	O
Common	B-Language
Lisp	I-Language
.	O
</s>
<s>
It	O
is	O
now	O
part	O
of	O
the	B-Application
GNU	I-Application
Project	I-Application
and	O
is	O
free	B-Application
software	I-Application
,	O
available	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
.	O
</s>
<s>
Haible	O
did	O
not	O
originally	O
intend	O
to	O
distribute	O
CLISP	B-Application
under	O
the	O
GPL	B-License
,	O
but	O
in	O
a	O
well-publicised	O
email	O
exchange	O
with	O
Richard	O
Stallman	O
,	O
he	O
eventually	O
agreed	O
to	O
do	O
so	O
.	O
</s>
<s>
The	O
issue	O
at	O
stake	O
was	O
whether	O
CLISP	B-Application
was	O
a	O
derivative	O
work	O
of	O
the	O
GNU	B-Application
readline	I-Application
library	B-Library
.	O
</s>
<s>
CLISP	B-Application
is	O
extremely	O
portable	O
,	O
running	O
on	O
almost	O
all	O
Unix-based	O
operating	B-General_Concept
systems	I-General_Concept
as	O
well	O
as	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Although	O
interpreting	O
bytecode	O
is	O
usually	O
slower	O
than	O
running	O
compiled	B-Language
native	O
binaries	O
,	O
this	O
is	O
not	O
always	O
a	O
major	O
issue	O
(	O
especially	O
in	O
applications	O
like	O
Web	O
development	O
where	O
I/O	O
is	O
the	O
bottleneck	O
)	O
.	O
</s>
<s>
CLISP	B-Application
is	O
also	O
easier	O
to	O
set	O
up	O
than	O
other	O
popular	O
FOSS	B-License
Common	B-Language
Lisps	I-Language
such	O
as	O
SBCL	B-Language
.	O
</s>
<s>
Paul	O
Graham	O
used	O
CLISP	B-Application
to	O
run	O
the	O
software	O
for	O
his	O
Viaweb	B-Application
startup	O
.	O
</s>
<s>
Viaweb	B-Application
was	O
an	O
early	O
web	B-Application
application	I-Application
;	O
portions	O
of	O
it	O
still	O
exist	O
as	O
Yahoo	B-Application
!	I-Application
</s>
<s>
Stores	O
,	O
the	O
base	O
for	O
Yahoo	B-Application
Shopping	O
.	O
</s>
<s>
Conrad	O
Barski	O
's	O
Land	O
of	O
Lisp	O
uses	O
some	O
CLISP-specific	O
functions	O
in	O
the	O
textbook	O
exercises	O
.	O
</s>
