<s>
A	O
functoid	B-Operating_System
is	O
a	O
tool	O
for	O
applying	O
methods	O
to	O
data	O
via	O
a	O
GUI	B-Application
drag	O
'	O
n	O
drop	O
interface	O
from	O
within	O
the	O
BizTalk	B-Application
Mapping	O
tool	O
.	O
</s>
<s>
In	O
a	O
typical	O
BizTalk	B-Application
map	O
,	O
the	O
data	O
is	O
copied	O
from	O
a	O
source	O
to	O
a	O
destination	O
by	O
dragging	O
a	O
line	O
between	O
the	O
two	O
.	O
</s>
<s>
A	O
functoid	B-Operating_System
sits	O
in	O
the	O
middle	O
of	O
this	O
operation	O
and	O
applies	O
its	O
method	O
to	O
the	O
incoming	O
data	O
so	O
as	O
to	O
transform	O
it	O
to	O
the	O
requirements	O
of	O
the	O
destination	O
.	O
</s>
<s>
By	O
default	O
functoids	B-Operating_System
are	O
arranged	O
into	O
9	O
categories	O
based	O
on	O
their	O
functions	O
.	O
</s>
<s>
Microsoft	B-Application
BizTalk	I-Application
Server	I-Application
offers	O
the	O
ability	O
to	O
create	O
custom	O
functoids	B-Operating_System
by	O
referencing	O
a	O
DLL	O
into	O
a	O
BizTalk	B-Application
project	O
and	O
accessing	O
its	O
methods	O
.	O
</s>
