<s>
Itk	B-Language
is	O
a	O
framework	O
for	O
building	O
mega-widgets	O
using	O
the	O
Incr	B-Application
Tcl	I-Application
object	B-Language
system	I-Language
.	O
</s>
<s>
Mega-widgets	O
are	O
high-level	O
widgets	O
like	O
a	O
file	O
browser	O
or	O
a	O
tab	O
notebook	O
that	O
act	O
like	O
ordinary	O
Tk	B-Application
widgets	O
but	O
are	O
constructed	O
using	O
Tk	B-Application
widgets	O
as	O
component	O
parts	O
,	O
without	O
having	O
to	O
write	O
C	O
code	O
.	O
</s>
<s>
In	O
effect	O
,	O
a	O
mega-widget	O
looks	O
and	O
acts	O
exactly	O
like	O
a	O
Tk	B-Application
widget	O
,	O
but	O
is	O
considerably	O
easier	O
to	O
implement	O
.	O
</s>
