<s>
In	O
information	B-General_Concept
technology	I-General_Concept
,	O
a	O
notification	B-Application
system	I-Application
is	O
a	O
combination	O
of	O
software	O
and	O
hardware	B-Architecture
that	O
provides	O
a	O
means	O
of	O
delivering	O
a	O
message	O
to	O
a	O
set	O
of	O
recipients	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
notification	B-Application
system	I-Application
can	O
send	O
an	O
e-mail	O
announcing	O
when	O
a	O
computer	B-Architecture
network	I-Architecture
will	O
be	O
down	O
for	O
a	O
scheduled	O
maintenance	O
.	O
</s>
<s>
The	O
complexity	O
of	O
the	O
notification	B-Application
system	I-Application
may	O
vary	O
.	O
</s>
<s>
Complicated	O
notification	B-Application
systems	I-Application
are	O
used	O
by	O
businesses	O
to	O
reach	O
critical	O
employees	O
.	O
</s>
<s>
Emergency	O
notification	B-Application
systems	I-Application
may	O
take	O
advantage	O
of	O
modern	O
information	B-General_Concept
technologies	I-General_Concept
.	O
</s>
<s>
In	O
mobile	O
phones	O
and	O
smartphones	B-Application
,	O
dedicated	O
hardware	B-Architecture
such	O
as	O
a	O
notification	B-Application
LED	I-Application
is	O
sometimes	O
included	O
to	O
deliver	O
messages	O
or	O
notify	O
users	O
.	O
</s>
