<s>
A	O
Preference	B-Operating_System
Pane	I-Operating_System
(	O
often	O
abbreviated	O
as	O
prefpane	B-Operating_System
)	O
is	O
a	O
special	O
dynamically	B-Operating_System
loaded	I-Operating_System
plugin	B-Application
in	O
macOS	B-Application
.	O
</s>
<s>
Introduced	O
in	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.0	I-Operating_System
,	O
the	O
purpose	O
of	O
a	O
Preference	B-Operating_System
Pane	I-Operating_System
is	O
to	O
allow	O
the	O
user	O
to	O
set	O
preferences	O
for	O
a	O
specific	O
application	O
or	O
the	O
system	O
by	O
means	O
of	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
.	O
</s>
<s>
Preference	B-Operating_System
Panes	I-Operating_System
are	O
the	O
macOS	B-Application
replacement	O
for	O
control	B-Operating_System
panels	I-Operating_System
in	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
Prior	O
to	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
,	O
collections	O
of	O
Preference	B-Operating_System
Panes	I-Operating_System
featured	O
a	O
"	O
Show	O
All	O
"	O
button	O
to	O
show	O
all	O
the	O
panes	O
in	O
the	O
collection	O
and	O
a	O
customizable	O
toolbar	O
to	O
which	O
frequently-used	O
preference	B-Operating_System
panes	I-Operating_System
could	O
be	O
dragged	O
.	O
</s>
<s>
In	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
v10.3	I-Operating_System
,	O
the	O
currently-active	O
pane	O
would	O
also	O
be	O
highlighted	O
in	O
the	O
toolbar	O
when	O
it	O
was	O
selected	O
.	O
</s>
<s>
With	O
Mac	B-Application
OS	I-Application
X	I-Application
v10.4	I-Application
,	O
this	O
functionality	O
was	O
dropped	O
in	O
favor	O
of	O
a	O
plain	O
Show	O
All	O
button	O
and	O
back/forward	O
history	O
arrows	O
.	O
</s>
<s>
System	B-Operating_System
Settings	I-Operating_System
is	O
an	O
application	O
whose	O
sole	O
purpose	O
is	O
the	O
loading	O
of	O
various	O
preference	B-Operating_System
panes	I-Operating_System
,	O
for	O
system	O
configuration	O
.	O
</s>
<s>
Any	O
application	O
can	O
be	O
written	O
to	O
use	O
prefpanes	B-Operating_System
.	O
</s>
<s>
Preference	B-Operating_System
panes	I-Operating_System
carry	O
the	O
.prefpane	B-Operating_System
file	O
extension	O
.	O
</s>
