[Info-vax] VMS internals design, was: Re: BASIC and AST routines

[Jan-Erik Söderholm]

>> On 11/25/2021 4:04 PM, Bill Gunshannon wrote:
>>>
>>> I would really like to know what people could be running on
>>> VMS on an Itanic that would be so difficult to move to a
>>> totally different system.  Any applications are almost
>>> guaranteed to be written in an HLL.  Just what is it that
>>> they are doing on VMS that can not be done on another
>>> system?
>>>
>>> bill
>>>

An "application" is not only the core routines in Cobol or
some other HLL. There are usually also a lot of routines that
are written (for VMS) in DCL that "runs" the applications.

And the whole application infrastructure can rely on VMS unique
things like logical names, mailboxes and other stuff.

I guess the majority of an porting effort is to move off the
VMS unique features.