<s>
PC-LISP	B-Application
is	O
an	O
implementation	O
of	O
the	O
Franz	O
Lisp	O
dialect	O
by	O
Peter	O
Ashwood-Smith	O
.	O
</s>
<s>
Currently	O
,	O
PC-LISP	B-Application
has	O
been	O
ported	O
to	O
32	O
&	O
64	O
bit	O
Linux	O
,	O
Mac	O
,	O
and	O
Windows	O
.	O
</s>
<s>
Note	O
that	O
the	O
Franz	O
LISP	O
dialect	O
was	O
the	O
immediate	O
,	O
portable	O
successor	O
to	O
the	O
ITS	B-Application
version	O
of	O
Maclisp	B-Language
and	O
is	O
perhaps	O
the	O
closest	O
thing	O
to	O
the	O
LISP	O
in	O
the	O
Steven	O
Levy	O
book	O
Hackers	O
as	O
is	O
practical	O
to	O
operate	O
.	O
</s>
<s>
PC-LISP	B-Application
runs	O
well	O
in	O
DOS	O
emulators	O
and	O
on	O
modern	O
Windows	O
versions	O
.	O
</s>
<s>
Because	O
PC-LISP	B-Application
implements	O
Franz	O
LISP	O
,	O
it	O
is	O
a	O
dynamically	O
scoped	O
predecessor	O
to	O
modern	O
Common	B-Language
Lisp	I-Language
.	O
</s>
<s>
Note	O
that	O
PC-LISP	B-Application
does	O
not	O
implement	O
the	O
let	O
special	O
form	O
that	O
Emacs	B-Operating_System
Lisp	I-Operating_System
provides	O
for	O
local	O
variables	O
.	O
</s>
<s>
Instead	O
,	O
all	O
variables	O
are	O
what	O
an	O
ALGOL-based	O
language	O
would	O
call	O
"	O
global	O
"	O
.	O
</s>
<s>
The	O
first	O
dialect	O
of	O
Lisp	O
to	O
incorporate	O
ALGOL	B-Language
scoping	O
rules	O
(	O
called	O
lexical	O
scoping	O
)	O
was	O
Scheme	B-Language
although	O
the	O
Common	B-Language
Lisp	I-Language
language	I-Language
also	O
added	O
this	O
feature	O
.	O
</s>
