<s>
Apple	B-Operating_System
Dylan	I-Operating_System
is	O
the	O
original	O
implementation	O
of	O
the	O
programming	O
language	O
Dylan	B-Language
.	O
</s>
<s>
Dylan	B-Language
was	O
developed	O
at	O
Apple	O
Cambridge	O
,	O
formerly	O
Coral	O
Software	O
,	O
developers	O
of	O
Macintosh	B-Language
Common	I-Language
Lisp	I-Language
.	O
</s>
<s>
The	O
original	O
language	O
had	O
much	O
in	O
common	O
with	O
Lisp	B-Language
,	O
including	O
its	O
parenthetical	O
S-expression	B-Protocol
syntax	O
.	O
</s>
<s>
For	O
a	O
time	O
,	O
it	O
was	O
developed	O
with	O
the	O
intent	O
of	O
being	O
the	O
primary	O
language	O
of	O
the	O
Apple	B-Device
Newton	I-Device
.	O
</s>
<s>
When	O
that	O
project	O
was	O
ordered	O
into	O
production	O
earlier	O
than	O
expected	O
,	O
Dylan	B-Language
was	O
not	O
ready	O
for	O
release	O
.	O
</s>
<s>
A	O
new	O
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
Newton	B-Device
was	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
Dylan	B-Language
was	O
then	O
repositioned	O
as	O
a	O
desktop	O
programming	O
system	O
for	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
Work	O
continued	O
for	O
another	O
six	O
months	O
to	O
produce	O
the	O
Apple	B-Operating_System
Dylan	I-Operating_System
Technology	O
Release	O
.	O
</s>
<s>
Apple	B-Operating_System
Dylan	I-Operating_System
includes	O
a	O
dynamic	O
,	O
integrated	B-Application
development	I-Application
environment	I-Application
inspired	O
by	O
Smalltalk	B-Application
,	O
Macintosh	B-Language
Common	I-Language
Lisp	I-Language
(	O
MCL	O
)	O
,	O
and	O
Think	B-Operating_System
C	I-Operating_System
,	O
and	O
originally	O
codenamed	O
Hula	O
.	O
</s>
<s>
Like	O
Think	B-Operating_System
C	I-Operating_System
,	O
but	O
unlike	O
Smalltalk	B-Application
and	O
Lisp	B-Language
,	O
it	O
draws	O
a	O
clear	O
distinction	O
between	O
the	O
development	O
environment	O
and	O
the	O
program	O
being	O
developed	O
.	O
</s>
<s>
It	O
does	O
this	O
by	O
linking	O
code	O
,	O
called	O
a	O
stub	O
,	O
into	O
the	O
target	O
program	O
,	O
allowing	O
the	O
integrated	B-Application
development	I-Application
environment	I-Application
(	O
IDE	O
)	O
to	O
communicate	O
with	O
it	O
(	O
to	O
inject	O
code	O
,	O
perform	O
introspection	O
,	O
etc	O
.	O
</s>
<s>
)	O
,	O
without	O
sharing	O
a	O
runtime	B-Device
system	I-Device
environment	O
with	O
the	O
IDE	O
.	O
</s>
<s>
The	O
IDE	O
includes	O
Binder	O
(	O
a	O
tool	O
for	O
configuring	O
browsers	O
)	O
,	O
a	O
source	O
database	O
,	O
a	O
definition	O
database	O
,	O
incremental	O
compiling	B-Language
,	O
a	O
cross-platform	O
source	O
debugger	O
,	O
profiling	O
tools	O
,	O
and	O
an	O
interface	O
builder	O
.	O
</s>
<s>
The	O
basic	O
browser	O
window	O
in	O
the	O
Apple	B-Operating_System
Dylan	I-Operating_System
environment	O
is	O
Binder	O
.	O
</s>
<s>
Aspects	O
are	O
properties	O
of	O
the	O
input	O
,	O
such	O
as	O
source	O
code	O
,	O
contents	O
,	O
callers	O
,	O
readers	O
,	O
writers	O
,	O
references	O
or	O
compiling	B-Language
warnings	O
.	O
</s>
<s>
Inputs	O
,	O
aspects	O
and	O
styles	O
can	O
be	O
used	O
to	O
construct	O
replicas	O
of	O
the	O
Smalltalk	B-Application
source	O
browser	O
,	O
or	O
static	O
call	O
graphs	O
,	O
or	O
ad	O
hoc	O
displays	O
such	O
as	O
the	O
callers	O
of	O
readers	O
of	O
variables	O
that	O
the	O
selected	O
function	O
writes	O
.	O
</s>
<s>
The	O
outline	O
view	O
includes	O
visual	O
indicators	O
that	O
display	O
whether	O
a	O
source	O
record	O
has	O
unsaved	O
changes	O
,	O
has	O
changed	O
since	O
it	O
was	O
last	O
compiled	B-Language
,	O
or	O
has	O
compiler-generated	O
messages	O
(	O
warnings	O
and	O
errors	O
)	O
.	O
</s>
<s>
Apple	B-Operating_System
Dylan	I-Operating_System
includes	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
(	O
GUI	B-Application
)	O
framework	O
,	O
written	O
in	O
Dylan	B-Language
by	O
Mike	O
Lockwood	O
.	O
</s>
<s>
The	O
framework	O
is	O
tightly	O
integrated	O
with	O
a	O
WYSIWYG	B-Application
(	O
What	B-Application
You	I-Application
See	I-Application
Is	I-Application
What	I-Application
You	I-Application
Get	I-Application
)	O
interface	O
builder	O
code-named	O
Meccano	O
,	O
written	O
by	O
Robin	O
Mair	O
.	O
</s>
<s>
The	O
core	O
of	O
Apple	B-Operating_System
Dylan	I-Operating_System
is	O
implemented	O
in	O
Macintosh	B-Language
Common	I-Language
Lisp	I-Language
,	O
upon	O
which	O
the	O
rest	O
is	O
implemented	O
in	O
Dylan	B-Language
.	O
</s>
<s>
The	O
Apple	O
Cambridge	O
office	O
started	O
as	O
an	O
acquisition	O
of	O
Coral	O
Software	O
,	O
the	O
developers	O
of	O
Macintosh	B-Language
Common	I-Language
Lisp	I-Language
.	O
</s>
<s>
When	O
Dylan	B-Language
was	O
retargeted	B-Application
from	O
the	O
ARM	B-Architecture
processor	I-Architecture
of	O
the	O
Newton	B-Device
,	O
to	O
the	O
desktop	O
Macintosh	B-Device
,	O
the	O
back	O
end	O
was	O
modified	O
to	O
use	O
APPLEX	O
,	O
a	O
portable	O
assembler	B-Language
designed	O
by	O
Wayne	O
Loofbourrow	O
's	O
team	O
at	O
Apple	O
in	O
Cupertino	O
.	O
</s>
