<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
(	O
)	O
(	O
)	O
is	O
the	O
twelfth	O
major	O
release	O
of	O
macOS	B-Application
(	O
named	O
OS	O
X	O
at	O
the	O
time	O
of	O
El	O
Capitan	O
's	O
release	O
)	O
,	O
Apple	O
Inc.	O
'	O
s	O
desktop	O
and	O
server	B-Application
operating	O
system	O
for	O
Macintosh	B-Device
.	O
</s>
<s>
Following	O
the	O
California	O
location-based	O
naming	O
scheme	O
introduced	O
with	O
OS	B-Operating_System
X	I-Operating_System
Mavericks	I-Operating_System
,	O
El	O
Capitan	O
was	O
named	O
after	O
a	O
rock	O
formation	O
in	O
Yosemite	B-Device
National	O
Park	O
.	O
</s>
<s>
El	O
Capitan	O
is	O
the	O
final	O
version	O
to	O
be	O
released	O
under	O
the	O
name	O
OS	O
X	O
.	O
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
received	O
far	O
better	O
reviews	O
than	O
Yosemite	B-Device
.	O
</s>
<s>
The	O
first	O
beta	O
of	O
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
was	O
released	O
to	O
developers	O
shortly	O
following	O
the	O
WWDC	O
keynote	O
on	O
June	O
8	O
,	O
2015	O
.	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
was	O
released	O
to	O
end	O
users	O
on	O
September	O
30	O
,	O
2015	O
,	O
as	O
a	O
free	O
upgrade	O
through	O
the	O
Mac	B-Application
App	I-Application
Store	I-Application
.	O
</s>
<s>
All	O
Macintosh	B-Device
products	O
that	O
can	O
run	O
Mountain	B-Operating_System
Lion	I-Operating_System
,	O
Mavericks	B-Operating_System
,	O
or	O
Yosemite	B-Device
can	O
run	O
El	O
Capitan	O
,	O
although	O
not	O
all	O
of	O
its	O
features	O
will	O
work	O
on	O
older	O
models	O
.	O
</s>
<s>
For	O
example	O
,	O
Apple	B-Operating_System
notes	I-Operating_System
that	O
the	O
newly	O
available	O
Metal	B-Library
API	I-Library
is	O
available	O
on	O
"	O
all	O
Macs	O
since	O
2012	O
"	O
.	O
</s>
<s>
They	O
can	O
only	O
run	O
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
if	O
they	O
have	O
at	O
least	O
2	O
GB	O
of	O
RAM	O
.	O
</s>
<s>
The	O
following	O
computers	O
support	O
features	O
such	O
as	O
Handoff	O
,	O
Instant	B-Application
Hotspot	I-Application
,	O
AirDrop	B-Operating_System
between	O
Mac	O
computers	O
and	O
iOS	O
devices	O
,	O
as	O
well	O
as	O
the	O
new	O
Metal	B-Library
API	I-Library
:	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
includes	O
features	O
to	O
improve	O
the	O
security	O
,	O
performance	O
,	O
design	O
and	O
usability	O
of	O
OS	O
X	O
.	O
</s>
<s>
Compared	O
to	O
OS	B-Device
X	I-Device
Yosemite	I-Device
,	O
Apple	O
says	O
that	O
opening	O
PDFs	B-Application
is	O
four	O
times	O
faster	O
,	O
app	O
switching	O
and	O
viewing	O
messages	B-Protocol
in	O
Mail	B-Operating_System
is	O
twice	O
as	O
fast	O
and	O
launching	O
apps	O
is	O
40%	O
faster	O
.	O
</s>
<s>
The	O
maximum	O
amount	O
of	O
memory	O
that	O
could	O
be	O
allocated	O
to	O
the	O
graphics	B-Architecture
processor	I-Architecture
has	O
been	O
increased	O
from	O
1024	O
MB	O
to	O
1536	O
MB	O
on	O
Macs	O
with	O
an	O
Intel	B-Application
HD	I-Application
4000	I-Application
GPU	B-Architecture
.	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
supports	O
Metal	B-Library
,	O
Apple	O
's	O
graphics	O
API	O
introduced	O
in	O
iOS	B-Operating_System
8	I-Operating_System
to	O
speed	O
up	O
performance	O
in	O
games	O
and	O
professional	O
applications	O
.	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
also	O
adopts	O
LibreSSL	B-Language
in	O
replacement	O
of	O
OpenSSL	B-Language
used	O
in	O
previous	O
versions	O
.	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
introduces	O
new	O
window	B-Application
management	I-Application
features	O
such	O
as	O
creating	O
a	O
full-screen	O
split	O
screen	O
limited	O
to	O
two	O
app	O
windows	O
side	O
by	O
side	O
in	O
full	O
screen	O
by	O
pressing	O
the	O
green	O
button	O
on	O
left	O
upper	O
corner	O
of	O
the	O
window	O
or	O
keyboard	O
shortcut	O
,	O
then	O
snapping	O
any	O
supported	O
other	O
window	O
to	O
that	O
full	O
screen	O
application	O
.	O
</s>
<s>
This	O
feature	O
is	O
slightly	O
similar	O
to	O
,	O
although	O
less	O
extensive	O
than	O
,	O
the	O
snap-assist	O
feature	O
in	O
Windows	B-Device
7	I-Device
(	O
and	O
later	O
)	O
and	O
several	O
Linux	B-Application
desktop	O
environments	O
,	O
such	O
as	O
GNOME	B-Application
.	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
improves	O
Mission	O
Control	O
to	O
incorporate	O
this	O
feature	O
across	O
multiple	O
spaces	O
.	O
</s>
<s>
It	O
also	O
enables	O
users	O
to	O
spot	O
the	O
pointer	O
more	O
easily	O
by	O
enlarging	O
it	O
by	O
shaking	O
the	O
mouse	O
or	O
swiping	O
a	O
finger	O
back	O
and	O
forth	O
on	O
the	O
trackpad	B-Device
.	O
</s>
<s>
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
adds	O
multi-touch	B-Application
gestures	O
to	O
applications	O
like	O
Mail	B-Operating_System
and	O
Messages	B-Protocol
that	O
allow	O
a	O
user	O
to	O
delete	O
or	O
mark	O
emails	O
or	O
conversations	O
by	O
swiping	O
a	O
finger	O
on	O
a	O
multi-touch	B-Application
device	O
,	O
such	O
as	O
a	O
trackpad	B-Device
.	O
</s>
<s>
OS	O
X	O
also	O
analyzes	O
the	O
contents	O
of	O
individual	O
emails	O
in	O
Mail	B-Operating_System
and	O
uses	O
the	O
gathered	O
information	O
in	O
other	O
applications	O
,	O
such	O
as	O
Calendar	B-Operating_System
.	O
</s>
<s>
For	O
example	O
,	O
an	O
invitation	O
in	O
Mail	B-Operating_System
can	O
automatically	O
be	O
added	O
as	O
a	O
Calendar	B-Operating_System
event	O
.	O
</s>
<s>
Apple	B-Application
Maps	I-Application
in	O
El	O
Capitan	O
shows	O
public	O
transit	O
information	O
similar	O
to	O
Maps	O
in	O
iOS	B-Operating_System
9	I-Operating_System
.	O
</s>
<s>
This	O
feature	O
was	O
limited	O
to	O
a	O
handful	O
of	O
cities	O
upon	O
launch	O
:	O
Baltimore	O
,	O
Berlin	O
,	O
Chicago	O
,	O
London	O
,	O
Los	O
Angeles	O
,	O
Mexico	O
City	O
,	O
New	O
York	O
City	O
,	O
Paris	O
,	O
Philadelphia	O
,	O
San	O
Francisco	O
,	O
Shanghai	B-Device
,	O
Toronto	O
and	O
Washington	O
D.C.	O
</s>
