<s>
The	O
Server	B-Application
Change	I-Application
Number	I-Application
(	O
SCN	O
)	O
is	O
a	O
counter	O
variable	O
used	O
in	O
Client/Server	O
Architecture	O
systems	O
to	O
find	O
out	O
whether	O
the	O
server	B-Application
state	O
could	O
be	O
synchronized	O
with	O
the	O
state	O
of	O
the	O
client	B-Protocol
.	O
</s>
<s>
The	O
number	O
is	O
incremented	O
once	O
the	O
server	B-Application
has	O
successfully	O
integrated	O
changes	O
coming	O
from	O
the	O
client	B-Protocol
in	O
the	O
case	O
of	O
a	O
server-side	O
event	O
.	O
</s>
