<s>
RPG	B-Language
III	I-Language
is	O
a	O
dialect	O
of	O
the	O
RPG	B-Language
programming	I-Language
language	I-Language
that	O
was	O
first	O
announced	O
with	O
the	O
IBM	B-Device
System/38	I-Device
in	O
1978	O
.	O
</s>
<s>
An	O
upgraded	O
version	O
,	O
RPG	B-Language
IV	I-Language
,	O
was	O
introduced	O
in	O
1994	O
.	O
</s>
<s>
In	O
2001	O
RPG	B-Language
was	O
again	O
updated	O
to	O
remove	O
a	O
number	O
of	O
column	O
restrictions	O
.	O
</s>
<s>
RPG	B-Language
continues	O
to	O
be	O
upgraded	O
on	O
a	O
regular	O
basis	O
.	O
</s>
<s>
Other	O
than	O
sharing	O
some	O
opcodes	O
and	O
terminology	O
,	O
modern	O
RPG	B-Language
IV	I-Language
is	O
visually	O
very	O
different	O
from	O
RPG	B-Language
III	I-Language
.	O
</s>
<s>
Unlike	O
predecessors	O
,	O
RPG	B-Language
III	I-Language
uses	O
external	O
file	O
descriptions	O
,	O
which	O
means	O
that	O
disk	O
files	O
are	O
built	O
and	O
RPG	B-Language
III	I-Language
programs	O
are	O
attached	O
to	O
them	O
at	O
compile	O
time	O
.	O
</s>
<s>
Some	O
other	O
noteworthy	O
changes	O
from	O
RPG	B-Language
II	I-Language
include	O
:	O
</s>
<s>
It	O
must	O
be	O
compiled	O
in	O
the	O
library	O
associated	O
with	O
the	O
external	O
files	O
(	O
unlike	O
System	B-Operating_System
Support	I-Operating_System
Program	I-Operating_System
,	O
Control	B-Operating_System
Program	I-Operating_System
Facility	I-Operating_System
libraries	O
contain	O
data	O
files	O
.	O
)	O
</s>
<s>
Display	O
formats	O
used	O
by	O
RPG	B-Language
III	I-Language
programs	O
also	O
describe	O
the	O
fields	O
displayed	O
and	O
received	O
by	O
the	O
RPG	B-Language
III	I-Language
WORKSTN	O
file	O
.	O
</s>
<s>
The	O
display	O
format	O
object	O
used	O
by	O
an	O
RPG	B-Language
III	I-Language
program	O
must	O
be	O
compiled	O
before	O
the	O
RPG	B-Language
III	I-Language
program	O
itself	O
.	O
</s>
