<s>
Apple	O
's	O
Bonjour	B-Protocol
Sleep	I-Protocol
Proxy	I-Protocol
service	O
is	O
an	O
open	B-License
source	I-License
component	O
of	O
zero-configuration	B-Application
networking	I-Application
,	O
designed	O
to	O
assist	O
in	O
reducing	O
power	O
consumption	O
of	O
networked	B-Architecture
electronic	O
devices	O
.	O
</s>
<s>
A	O
device	O
acting	O
as	O
a	O
sleep	B-Protocol
proxy	I-Protocol
server	O
will	O
respond	O
to	O
Multicast	B-Protocol
DNS	I-Protocol
queries	O
for	O
another	O
compatible	O
device	O
which	O
has	O
gone	O
into	O
low	O
power	O
mode	O
.	O
</s>
<s>
The	O
low-power-mode	O
device	O
remains	O
asleep	O
while	O
the	O
sleep	B-Protocol
proxy	I-Protocol
server	O
responds	O
to	O
Multicast	B-Protocol
DNS	I-Protocol
queries	O
.	O
</s>
<s>
When	O
the	O
sleep	B-Protocol
proxy	I-Protocol
server	O
sees	O
a	O
query	O
which	O
requires	O
the	O
low-power-mode	O
device	O
to	O
wake	O
up	O
,	O
the	O
sleep	B-Protocol
proxy	I-Protocol
server	O
sends	O
a	O
special	O
wake-up-packet	O
(	O
"	O
magic	O
packet	O
"	O
)	O
to	O
the	O
low-power-mode	O
device	O
.	O
</s>
<s>
Finally	O
,	O
communication	O
parameters	O
are	O
updated	O
via	O
Multicast	B-Protocol
DNS	I-Protocol
,	O
and	O
normal	O
communications	O
proceed	O
.	O
</s>
<s>
Apple	O
refers	O
to	O
the	O
service	O
as	O
Bonjour	B-Protocol
Sleep	I-Protocol
Proxy	I-Protocol
in	O
its	O
support	O
documents	O
.	O
</s>
<s>
The	O
service	O
supports	O
the	O
Wake	B-Protocol
on	I-Protocol
Demand	I-Protocol
feature	O
,	O
first	O
offered	O
in	O
Mac	B-Device
OS	I-Device
X	I-Device
Snow	I-Device
Leopard	I-Device
.	O
</s>
<s>
The	O
sleep	B-Protocol
proxy	I-Protocol
service	I-Protocol
responds	O
to	O
address	O
resolution	O
protocol	O
requests	O
on	O
behalf	O
of	O
the	O
low-power-mode	O
device	O
:	O
</s>
<s>
When	O
a	O
sleep	B-Protocol
proxy	I-Protocol
sees	O
an	O
IPv4	O
ARP	O
or	O
IPv6	O
ND	O
Request	O
for	O
one	O
of	O
the	O
sleeping	O
device	O
's	O
addresses	O
,	O
it	O
answers	O
on	O
behalf	O
of	O
the	O
sleeping	O
device	O
,	O
without	O
waking	O
it	O
up	O
,	O
giving	O
its	O
own	O
MAC	O
address	O
as	O
the	O
current	O
(	O
temporary	O
)	O
owner	O
of	O
that	O
address	O
.	O
</s>
<s>
In	O
case	O
the	O
low-power-mode	O
device	O
is	O
communicating	O
via	O
Wi-Fi	O
,	O
the	O
wake-up-packet	O
is	O
sent	O
via	O
Wireless	B-General_Concept
Multimedia	I-General_Concept
Extensions	I-General_Concept
(	O
WMM	O
)	O
.	O
</s>
<s>
This	O
was	O
not	O
possible	O
in	O
previous	O
implementations	O
of	O
Wake	B-Protocol
on	I-Protocol
LAN	I-Protocol
(	O
WoL	O
)	O
.	O
</s>
<s>
The	O
sleep	B-Protocol
proxy	I-Protocol
service	I-Protocol
is	O
able	O
to	O
advertise	O
any	O
Bonjour-supported	O
services	O
,	O
while	O
the	O
host	O
computer	O
sleeps	O
.	O
</s>
<s>
File	O
sharing	O
:	O
a	O
host	O
supporting	O
the	O
sleep	B-Protocol
proxy	I-Protocol
service	I-Protocol
,	O
which	O
offers	O
file	O
services	O
,	O
may	O
go	O
to	O
sleep	O
as	O
needed	O
.	O
</s>
<s>
iTunes	B-Operating_System
library	I-Operating_System
sharing	I-Operating_System
:	O
the	O
computer	O
hosting	O
the	O
iTunes	B-Operating_System
library	O
may	O
go	O
to	O
sleep	O
,	O
and	O
will	O
automatically	O
wake	O
when	O
someone	O
wishes	O
to	O
browse	O
the	O
iTunes	B-Operating_System
library	O
from	O
a	O
different	O
PC	O
.	O
</s>
<s>
Printer	O
sharing	O
:	O
a	O
printer	O
may	O
be	O
connected	O
and	O
shared	O
from	O
a	O
computer	O
supporting	O
sleep	B-Protocol
proxy	I-Protocol
service	I-Protocol
.	O
</s>
<s>
SSH	B-Protocol
:	O
a	O
computer	O
offering	O
SSH	B-Protocol
access	O
may	O
go	O
to	O
sleep	O
,	O
and	O
awaken	O
via	O
the	O
sleep	B-Protocol
proxy	I-Protocol
service	I-Protocol
when	O
an	O
SSH	B-Protocol
login	O
is	O
initiated	O
.	O
</s>
<s>
Desktop	B-Device
sharing	I-Device
:	O
similar	O
to	O
above	O
examples	O
.	O
</s>
<s>
Implementations	O
on	O
a	O
local	B-General_Concept
area	I-General_Concept
network	I-General_Concept
can	O
be	O
seen	O
with	O
Bonjour	B-Application
Browser	O
.	O
</s>
<s>
Computers	O
running	O
Mac	B-Device
OS	I-Device
X	I-Device
Snow	I-Device
Leopard	I-Device
act	O
as	O
a	O
Bonjour	B-Protocol
sleep	I-Protocol
proxy	I-Protocol
server	O
when	O
Internet	B-Protocol
sharing	I-Protocol
is	O
enabled	O
.	O
</s>
