<s>
Channel	B-Application
Definition	I-Application
Format	I-Application
(	O
CDF	O
)	O
was	O
an	O
XML	B-Protocol
file	O
format	O
formerly	O
used	O
in	O
conjunction	O
with	O
Microsoft	O
's	O
Active	B-Application
Channel	I-Application
,	O
Active	O
Desktop	O
and	O
Smart	B-Application
Offline	I-Application
Favorites	I-Application
technologies	O
.	O
</s>
<s>
Active	B-Application
Channel	I-Application
allowed	O
users	O
to	O
subscribe	O
to	O
channels	O
and	O
have	O
scheduled	O
updates	O
delivered	O
to	O
their	O
desktop	O
.	O
</s>
<s>
Smart	B-Application
Offline	I-Application
Favorites	I-Application
,	O
like	O
channels	O
,	O
enabled	O
users	O
to	O
view	O
webpages	O
from	O
the	O
cache	O
.	O
</s>
<s>
Submitted	O
to	O
the	O
World	O
Wide	O
Web	O
Consortium	O
(	O
W3C	O
)	O
in	O
March	O
1997	O
for	O
consideration	O
as	O
a	O
web	O
standard	O
,	O
CDF	O
marked	O
Microsoft	O
's	O
attempt	O
to	O
capitalize	O
on	O
the	O
push	B-General_Concept
technology	I-General_Concept
trend	O
led	O
by	O
PointCast	B-Application
.	O
</s>
<s>
The	O
most	O
notable	O
implementation	O
of	O
CDF	O
was	O
Microsoft	O
's	O
Active	O
Desktop	O
,	O
an	O
optional	O
feature	O
introduced	O
with	O
the	O
Internet	B-Protocol
Explorer	I-Protocol
4.0	I-Protocol
browser	O
in	O
September	O
1997	O
.	O
</s>
<s>
Smart	B-Application
Offline	I-Application
Favorites	I-Application
was	O
introduced	O
in	O
Internet	B-Protocol
Explorer	I-Protocol
5.0	I-Protocol
.	O
</s>
<s>
As	O
a	O
consequence	O
,	O
Microsoft	O
removed	O
CDF	O
support	O
from	O
Internet	B-Application
Explorer	I-Application
7	I-Application
in	O
2006	O
.	O
</s>
