<s>
NETDATA	B-Application
is	O
a	O
file	O
format	O
used	O
primarily	O
for	O
data	O
transfer	O
and	O
storage	O
on	O
IBM	O
mainframe	B-Architecture
systems	O
,	O
although	O
implementations	O
are	O
available	O
for	O
other	O
systems	O
.	O
</s>
<s>
NETDATA	B-Application
files	O
are	O
80-byte	O
card	B-Device
image	I-Device
files	O
containing	O
unloaded	O
file	O
data	O
plus	O
metadata	O
to	O
allow	O
the	O
original	O
file	O
to	O
be	O
reconstituted	O
on	O
the	O
receiving	O
system	O
.	O
</s>
<s>
A	O
complete	O
NETDATA	B-Application
file	O
consists	O
of	O
a	O
number	O
of	O
control	O
records	O
,	O
followed	O
by	O
data	O
records	O
and	O
terminated	O
by	O
a	O
trailer	O
record	O
.	O
</s>
<s>
Control	O
records	O
have	O
a	O
six-character	O
EBCDIC	B-Language
identifier	O
in	O
bytes	O
2-7	O
following	O
the	O
length	O
and	O
flags	O
.	O
</s>
<s>
The	O
header	O
record	O
must	O
be	O
the	O
first	O
record	O
of	O
a	O
NETDATA	B-Application
file	O
.	O
</s>
<s>
A	O
note	O
file	O
(	O
sometimes	O
called	O
a	O
"	O
PROFS	B-Application
note	O
"	O
)	O
"	O
is	O
a	O
short	O
communication	O
,	O
the	O
kind	O
usually	O
done	O
by	O
letter	O
.	O
</s>
