<s>
Script	B-Operating_System
Debugger	I-Operating_System
is	O
a	O
Macintosh	B-Device
computer	I-Device
source	B-Application
code	I-Application
editor	I-Application
and	O
debugging	B-Application
environment	O
for	O
the	O
AppleScript	B-Application
programming	I-Application
language	I-Application
,	O
and	O
other	O
languages	O
based	O
on	O
Apple	O
Inc.	O
'	O
s	O
Open	O
Scripting	O
Architecture	O
.	O
</s>
<s>
Script	B-Operating_System
Debugger	I-Operating_System
version	O
1.0	O
was	O
released	O
in	O
1995	O
by	O
Mark	O
Alldritt	O
as	O
a	O
third-party	B-General_Concept
alternative	O
to	O
Apple	O
's	O
freeware	B-License
application	O
,	O
Script	B-Operating_System
Editor	I-Operating_System
.	O
</s>
<s>
These	O
two	O
products	O
today	O
are	O
defunct	O
,	O
leaving	O
only	O
Satimage	O
's	O
Smile	B-Operating_System
and	O
integrated	B-Application
development	I-Application
environments	I-Application
such	O
as	O
FaceSpan	O
(	O
also	O
from	O
Late	O
Night	O
)	O
and	O
AppleScript	B-Application
Studio	O
as	O
Script	B-Operating_System
Debugger	I-Operating_System
's	O
current	O
competitors	O
in	O
the	O
field	O
.	O
</s>
<s>
From	O
version	O
1	O
on	O
the	O
program	O
contained	O
several	O
notable	O
features	O
:	O
it	O
was	O
"	O
scriptable	O
,	O
"	O
(	O
it	O
could	O
be	O
used	O
to	O
create	O
scripts	O
to	O
control	O
itself	O
)	O
,	O
recordable	O
,	O
(	O
it	O
could	O
create	O
scripts	O
based	O
on	O
user	O
actions	O
)	O
,	O
and	O
attachable	O
,	O
(	O
scripts	O
could	O
be	O
written	O
to	O
respond	O
to	O
events	B-Application
)	O
.	O
</s>
<s>
More	O
importantly	O
,	O
Script	B-Operating_System
Debugger	I-Operating_System
now	O
allowed	O
inspection	O
of	O
running	O
applications	O
to	O
see	O
what	O
events	B-Application
they	O
were	O
emitting	O
.	O
</s>
<s>
True	O
to	O
its	O
name	O
,	O
the	O
new	O
utility	O
also	O
contained	O
a	O
full	O
debugger	B-Application
,	O
with	O
support	O
for	O
breakpoints	O
.	O
</s>
<s>
Script	B-Operating_System
Debugger	I-Operating_System
has	O
since	O
won	O
many	O
awards	O
in	O
the	O
Macintosh	B-Device
scripting	O
community	O
.	O
</s>
<s>
On	O
February	O
9	O
,	O
2006	O
,	O
version	O
4	O
of	O
Script	B-Operating_System
Debugger	I-Operating_System
was	O
released	O
.	O
</s>
<s>
This	O
version	O
was	O
completely	O
rewritten	O
to	O
take	O
full	O
advantage	O
of	O
the	O
new	O
Cocoa	B-Operating_System
and	O
Tiger	B-Application
APIs	O
.	O
</s>
<s>
The	O
new	O
release	O
also	O
included	O
an	O
improved	O
version	O
of	O
the	O
JavaScript	B-Application
OSA	I-Application
scripting	O
component	O
.	O
</s>
<s>
Version	O
5	O
of	O
Script	B-Operating_System
Debugger	I-Operating_System
was	O
released	O
in	O
June	O
2012	O
.	O
</s>
<s>
Version	O
6	O
of	O
Script	B-Operating_System
Debugger	I-Operating_System
was	O
released	O
in	O
June	O
2016	O
,	O
with	O
support	O
for	O
new	O
features	O
such	O
as	O
code	B-Application
folding	I-Application
and	O
AppleScriptObjC	O
.	O
</s>
<s>
Version	O
7	O
of	O
Script	B-Operating_System
Debugger	I-Operating_System
was	O
released	O
in	O
March	O
2018	O
,	O
introducing	O
the	O
free	O
"	O
Lite	O
"	O
mode	O
and	O
new	O
features	O
such	O
as	O
version	O
browsing	O
,	O
enhanced	O
applets	O
,	O
better	O
bundle	O
editing	O
.	O
</s>
