<s>
Notification	B-Operating_System
Center	I-Operating_System
is	O
a	O
feature	O
in	O
iOS	B-Application
,	O
iPadOS	B-Operating_System
,	O
macOS	B-Application
and	O
watchOS	B-Device
that	O
provides	O
an	O
overview	O
of	O
alerts	O
from	O
applications	O
.	O
</s>
<s>
Users	O
may	O
choose	O
what	O
applications	O
appear	O
in	O
Notification	B-Operating_System
Center	I-Operating_System
,	O
and	O
how	O
they	O
are	O
handled	O
.	O
</s>
<s>
Initially	O
released	O
with	O
iOS	B-Operating_System
5	I-Operating_System
in	O
October	O
2011	O
,	O
Notification	B-Operating_System
Center	I-Operating_System
was	O
made	O
available	O
on	O
Macs	O
as	O
part	O
of	O
OS	B-Operating_System
X	I-Operating_System
Mountain	I-Operating_System
Lion	I-Operating_System
in	O
July	O
2012	O
.	O
</s>
<s>
Notification	B-Operating_System
Center	I-Operating_System
was	O
released	O
in	O
iOS	B-Operating_System
5	I-Operating_System
to	O
replace	O
the	O
previous	O
system	O
for	O
dealing	O
with	O
push	O
and	O
local	O
notifications	O
.	O
</s>
<s>
Instead	O
of	O
interrupting	O
the	O
user	O
with	O
an	O
alert	O
,	O
Notification	B-Operating_System
Center	I-Operating_System
instead	O
displays	O
a	O
banner	O
at	O
the	O
top	O
of	O
the	O
screen	O
.	O
</s>
<s>
All	O
previous	O
notifications	O
are	O
collated	O
into	O
the	O
Notification	B-Operating_System
Center	I-Operating_System
panel	O
,	O
which	O
can	O
be	O
displayed	O
in	O
iOS	B-Application
by	O
dragging	O
down	O
from	O
the	O
status	O
bar	O
,	O
and	O
in	O
macOS	B-Application
by	O
clicking	O
on	O
the	O
notification	B-Operating_System
center	I-Operating_System
icon	O
to	O
the	O
very	O
right	O
on	O
the	O
menu	O
bar	O
at	O
the	O
top	O
of	O
the	O
screen	O
(	O
or	O
using	O
track-pad	O
gestures	O
,	O
swiping	O
from	O
right	O
to	O
left	O
)	O
.	O
</s>
<s>
When	O
an	O
iOS	B-Application
device	O
is	O
locked	O
,	O
new	O
notifications	O
appear	O
on	O
the	O
lock	O
screen	O
,	O
and	O
users	O
may	O
access	O
the	O
application	O
generating	O
the	O
alert	O
by	O
swiping	O
the	O
application	O
's	O
icon	O
with	O
their	O
finger	O
from	O
left	O
to	O
right	O
along	O
the	O
notification	O
.	O
</s>
<s>
Notification	B-Operating_System
Center	I-Operating_System
on	O
macOS	B-Application
also	O
includes	O
Weather	O
and	O
Stocks	O
widgets	O
,	O
displaying	O
information	O
on	O
the	O
weather	O
at	O
the	O
user	O
's	O
current	O
location	O
,	O
and	O
any	O
stocks	O
that	O
the	O
user	O
has	O
selected	O
in	O
the	O
Stocks	O
application	O
.	O
</s>
<s>
This	O
feature	O
was	O
not	O
available	O
on	O
iPad	B-Device
or	O
macOS	B-Application
until	O
the	O
release	O
of	O
iOS	B-Application
7	O
,	O
which	O
added	O
the	O
Weather	O
widget	O
to	O
the	O
iPad	B-Device
's	O
Notification	B-Operating_System
Center	I-Operating_System
.	O
</s>
<s>
Users	O
could	O
also	O
select	O
the	O
option	O
to	O
display	O
Twitter	B-Application
and	O
Facebook	B-Application
buttons	O
,	O
allowing	O
them	O
to	O
send	O
tweets	O
or	O
update	O
their	O
status	O
directly	O
from	O
Notification	B-Operating_System
Center	I-Operating_System
.	O
</s>
<s>
In	O
iOS	B-Application
7	O
,	O
however	O
,	O
the	O
option	O
to	O
send	O
tweets	O
or	O
update	O
Facebook	B-Application
statuses	O
has	O
been	O
removed	O
,	O
and	O
replaced	O
with	O
widgets	O
.	O
</s>
<s>
Any	O
application	O
that	O
uses	O
the	O
Push	B-Operating_System
Notifications	I-Operating_System
system	I-Operating_System
provided	O
by	O
Apple	O
,	O
or	O
local	O
notifications	O
,	O
may	O
use	O
Notification	B-Operating_System
Center	I-Operating_System
.	O
</s>
<s>
Users	O
may	O
customise	O
what	O
they	O
want	O
to	O
appear	O
in	O
Notification	B-Operating_System
Center	I-Operating_System
,	O
and	O
may	O
opt	O
to	O
stop	O
certain	O
applications	O
appearing	O
in	O
the	O
center	O
,	O
or	O
sending	O
alerts	O
to	O
their	O
screen	O
.	O
</s>
<s>
macOS	B-Application
users	O
may	O
also	O
disable	O
alerts	O
and	O
banners	O
for	O
a	O
day	O
,	O
stopping	O
notifications	O
appearing	O
on	O
the	O
screen	O
.	O
</s>
<s>
This	O
can	O
be	O
achieved	O
by	O
either	O
opening	O
the	O
Notification	B-Operating_System
Center	I-Operating_System
panel	O
,	O
scrolling	O
upward	O
,	O
and	O
toggling	O
Do	O
Not	O
Disturb	O
on	O
,	O
by	O
holding	O
the	O
Option	O
key	O
while	O
clicking	O
on	O
the	O
Notification	B-Operating_System
Center	I-Operating_System
icon	O
in	O
the	O
Menu	O
Bar	O
,	O
or	O
in	O
System	B-Operating_System
Preferences	I-Operating_System
.	O
</s>
<s>
However	O
,	O
any	O
notifications	O
sent	O
during	O
this	O
time	O
are	O
still	O
visible	O
in	O
the	O
Notification	B-Operating_System
Center	I-Operating_System
panel	O
.	O
</s>
<s>
A	O
similar	O
service	O
is	O
included	O
in	O
iOS	B-Application
6	O
as	O
part	O
of	O
the	O
Do	O
Not	O
Disturb	O
feature	O
.	O
</s>
