<s>
Google	B-Application
Gadgets	I-Application
are	O
dynamic	O
web	O
content	O
that	O
can	O
be	O
embedded	O
on	O
a	O
web	O
page	O
.	O
</s>
<s>
They	O
can	O
be	O
added	O
to	O
and	O
interact	O
strongly	O
with	O
Google	O
's	O
iGoogle	B-Application
personalized	O
home	O
page	O
(	O
discontinued	O
in	O
November	O
2013	O
,	O
although	O
iGoogle	B-Application
Gadgets	I-Application
still	O
work	O
on	O
other	O
websites	O
)	O
and	O
the	O
Google	B-Application
Desktop	I-Application
(	O
discontinued	O
in	O
September	O
2011	O
)	O
application	O
,	O
as	O
well	O
as	O
Google	B-Application
Wave	I-Application
(	O
also	O
no	O
longer	O
supported	O
by	O
Google	O
)	O
and	O
Google	B-Application
Sites	I-Application
.	O
</s>
<s>
Gadgets	O
are	O
developed	O
by	O
Google	O
and	O
third-party	O
developers	O
using	O
the	O
Google	B-Application
Gadgets	I-Application
API	I-Application
,	O
using	O
basic	O
web	O
technologies	O
such	O
as	O
XML	B-Protocol
and	O
JavaScript	B-Language
.	O
</s>
<s>
With	O
the	O
advent	O
of	O
Google	B-Application
Wave	I-Application
(	O
now	O
Apache	B-Application
Wave	I-Application
)	O
,	O
gadgets	O
became	O
able	O
to	O
have	O
persistent	O
storage	O
and	O
multi-user	O
capabilities	O
and	O
better	O
state	O
management	O
.	O
</s>
<s>
Gadgets	O
using	O
Google	B-Application
Wave	I-Application
in	O
this	O
way	O
were	O
simply	O
known	O
as	O
'	O
Wave	O
Gadgets	O
 '	O
.	O
</s>
<s>
For	O
instance	O
,	O
a	O
game	O
written	O
using	O
a	O
Google	B-Application
Gadget	I-Application
could	O
use	O
Google	B-Application
Wave	I-Application
technology	O
to	O
record	O
a	O
list	O
of	O
users	O
and	O
high	O
scores	O
without	O
having	O
to	O
worry	O
about	O
how	O
to	O
permanently	O
store	O
the	O
scores	O
on	O
a	O
hosted	O
server	O
.	O
</s>
<s>
The	O
use	O
of	O
Google	B-Application
Wave	I-Application
would	O
give	O
the	O
gadget	O
multi-user	O
and	O
permanent	O
storage	O
capabilities	O
.	O
</s>
<s>
For	O
example	O
,	O
scores	O
could	O
be	O
stored	O
in	O
a	O
Google	B-Application
Wave	I-Application
hosted	O
permanently	O
by	O
Google	O
at	O
no	O
cost	O
to	O
the	O
user	O
.	O
</s>
<s>
As	O
of	O
early	O
2013	O
,	O
Google	B-Application
Gadgets	I-Application
were	O
deprecated	O
in	O
Google	O
Spreadsheets	O
.	O
</s>
<s>
Google	B-Application
Gadgets	I-Application
are	O
written	O
in	O
XML	B-Protocol
and	O
can	O
have	O
HTML	B-Language
and	O
JavaScript	B-Language
components	O
,	O
and	O
were	O
able	O
to	O
use	O
Google	B-Application
Wave	I-Application
.	O
</s>
<s>
Here	O
is	O
an	O
example	O
of	O
a	O
Hello	O
World	O
program	O
written	O
using	O
Google	B-Application
Gadget	I-Application
technology	O
.	O
</s>
<s>
Google	B-Application
Gadgets	I-Application
API	I-Application
is	O
a	O
Google	O
API	B-General_Concept
which	O
allows	O
developers	O
to	O
create	O
Google	B-Application
Gadgets	I-Application
easily	O
.	O
</s>
