RPG/400 vs RPGIV (Was Re: Using VARLEN DDS keyword)

Jim Langston wrote:
> 
> This is what confuses me.
> 
> He said RPG/400.  I have a book, "AS/400 ILE RPG/400 Programmer's Guide".
> Isn't RPG/400 just ILE RPG/400 without using any of the ILE stuff, which
> is RPG IV?
> 
> Or does RPG/400 designate RPG III?  Or is it simpley that both RPG III and
> RPG IV were called RPG/400 and just the first version (RPG III) is called
> RPG/400, and the later versions are called ILE RPG or RPG IV?

Is that an IBM book?  The IBM manual I have is titled "ILE RPG for
AS/400(R) Programmer's Guide"

It's been my understanding that RPG/400 is a synonym for RPG III.  And
while not technically the same, RPG IV and ILE RPG are generally used
interchangably.  (I'm sure I'll be pounced on if my understandings are
not correct. :) )  From said manual, "ILE RPG is an implementation of
the RPG IV lanuage on the AS/400 system with the Operating System/400(R)
(OS/400(R)) operating system."
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