Thanks Helean and Lester,
I'll go to it :)))

> >I have several projects which must (for the moment) be supported under

IBO

> >V3 as well as a requirement to port projects to IBO V4. Can someone
> >suggest how I could manage this?
> >
> >Am I missing a document describing V3 -> V4 changes and porting issues?
> >
> >I am prepared to port all projects, but would require some assurance that
> >major breakages would not occur :))
>
> Not sure what you are expecting re "concurrent" (in your topic
> Subject). IBO 3 and IBO 4 are completely distinct versions. To maintain

a

> single base of sourcecode compilable with either will require the addition
> of conditional defines.

Opening a Project with IBO3, edit, compile. Later an IOB4 project........a
big ask, I know, but Lester has a reasonable solution. I'll investigate
further.

Regards
John