<s>
Apcupsd	B-Language
,	O
short	O
for	O
APC	O
UPS	O
daemon	B-Operating_System
,	O
is	O
a	O
utility	B-Application
that	O
runs	O
on	O
Linux	B-Application
,	O
UNIX	B-Application
,	O
macOS	B-Application
and	O
Windows	O
.	O
</s>
<s>
Apcupsd	B-Language
also	O
works	O
with	O
some	O
OEM-branded	O
products	O
(	O
e.g.	O
</s>
<s>
Apcupsd	B-Language
is	O
a	O
free	B-Application
software	I-Application
equivalent	O
of	O
the	O
APC	O
's	O
proprietary	B-Application
PowerChute	O
software	O
.	O
</s>
<s>
As	O
of	O
version	O
3.14	O
,	O
Apcupsd	B-Language
has	O
support	O
for	O
the	O
PowerChute	O
Network	O
Shutdown	O
function	O
as	O
well	O
as	O
many	O
other	O
features	O
.	O
</s>
<s>
Apcupsd	B-Language
runs	O
in	O
daemon	B-Operating_System
mode	O
so	O
to	O
keep	O
a	O
live	O
connection	O
with	O
the	O
UPS	O
.	O
</s>
<s>
Depending	O
on	O
the	O
settings	O
and	O
type	O
of	O
connection	O
,	O
Apcupsd	B-Language
either	O
polls	O
the	O
UPS	O
to	O
learn	O
about	O
its	O
current	O
state	O
,	O
or	O
receives	O
messages	O
from	O
the	O
UPS	O
itself	O
(	O
e.g.	O
</s>
<s>
Possible	O
types	O
of	O
connections	O
to	O
the	O
UPS	O
are	O
USB	B-Protocol
,	O
RS-232	O
or	O
Ethernet	O
.	O
</s>
<s>
Apcupsd	B-Language
can	O
communicate	O
with	O
other	O
instances	O
of	O
Apcupsd	B-Language
on	O
other	O
computers	O
and	O
maintain	O
a	O
client-server	O
relationship	O
with	O
them	O
.	O
</s>
