<s>
Wt	B-Protocol
(	O
pronounced	O
"	O
witty	O
"	O
)	O
is	O
an	O
open-source	B-Application
widget-centric	O
web	B-Application
framework	I-Application
for	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
has	O
an	O
API	B-Application
resembling	O
that	O
of	O
Qt	B-Language
framework	I-Language
(	O
although	O
it	O
was	O
developed	O
with	O
Boost	O
,	O
and	O
is	O
incompatible	O
when	O
mixed	O
with	O
Qt	B-Language
)	O
,	O
also	O
using	O
a	O
widget-tree	O
and	O
an	O
event-driven	B-Application
signal/slot	B-Language
system	I-Language
.	O
</s>
<s>
The	O
Wt	B-Protocol
's	O
design	O
goal	O
is	O
to	O
benefit	O
from	O
the	O
stateful	B-Application
component	B-Architecture
model	O
used	O
in	O
desktop-applications	O
APIs	B-Application
,	O
applied	O
to	O
web	O
development	O
—	O
instead	O
of	O
the	O
traditional	O
MVC	O
(	O
model	O
–	O
view	O
–	O
controller	O
)	O
design	O
pattern	O
.	O
</s>
<s>
While	O
the	O
library	B-Library
uses	O
a	O
desktop	O
software	O
development	O
process	O
,	O
it	O
does	O
support	O
some	O
web-specific	O
features	O
,	O
including	O
:	O
</s>
<s>
One	O
of	O
the	O
unique	O
features	O
of	O
Wt	B-Protocol
is	O
its	O
abstraction	O
layer	O
of	O
the	O
browser	O
rendering	O
model	O
.	O
</s>
<s>
The	O
library	B-Library
uses	O
Ajax	B-General_Concept
for	O
communicating	O
with	O
browsers	O
compatible	O
with	O
it	O
,	O
while	O
using	O
plain	O
HTML-form	O
post-backs	O
for	O
other	O
user	B-Protocol
agents	I-Protocol
.	O
</s>
<s>
Using	O
a	O
progressive	O
bootstrap-method	O
,	O
the	O
user	B-Application
interface	I-Application
is	O
rendered	O
as	O
a	O
plain	O
HTML	B-Language
document	B-General_Concept
first	O
,	O
then	O
,	O
provided	O
its	O
support	O
in	O
browser	O
,	O
it	O
is	O
automatically	O
upgraded	O
to	O
use	O
Ajax	B-General_Concept
for	O
increased	O
interactivity	O
.	O
</s>
<s>
In	O
this	O
way	O
,	O
Wt	B-Protocol
is	O
by	O
definition	O
:	O
</s>
<s>
The	O
only	O
server-side	O
framework	B-Application
implementing	O
the	O
strategy	O
of	O
progressive	O
enhancement	O
automatically	O
;	O
</s>
<s>
The	O
only	O
Ajax	B-General_Concept
framework	I-General_Concept
with	O
search	O
engine	O
optimization	O
(	O
SEO	O
)	O
qualities	O
.	O
</s>
<s>
Because	O
of	O
the	O
popularity	O
of	O
C/C	O
++	O
in	O
embedded	B-Architecture
system	I-Architecture
environments	O
,	O
Wt	B-Protocol
is	O
often	O
used	O
in	O
such	O
devices	O
and	O
(	O
as	O
a	O
consequence	O
)	O
has	O
been	O
highly	O
optimized	O
for	O
performance	O
.	O
</s>
<s>
program	O
in	O
Wt	B-Protocol
:	O
</s>
