Quest produces a product "Netbase Client" which may fit the bill.
From the introduction in the manual:

"Quest Software's Netbase Client gives programmers who are building
applications under UNIX- or PC-based systems a high-speed data access
tool that takes into account the uniqueness of the HP3000 proprietary
file structure.  Programmers familiar with the HP3000 will find building
client-server applications greatly simplified.

With Netbase Client, programs written on the HP3000 that access TurboIMAGE
databases or MPE files can be moved, with minor changes, to UNIX or PC
systems and recompiled."

  I was looking into a problem for one of my customers a while ago and happened
to speak with a person at Quest who recommended I look at this product.  I've
not actually used it (other priorities pushed the prior project aside), but it appears
to provide what you are asking for.

Regards,
Michael L Gueterman
Easy Does It Technologies
email: [log in to unmask]
http://www.editcorp.com
voice: (888) 858-EDIT -or- (509) 943-5108
fax:   (509) 946-1170
--

----------
From:  Joe Geiser[SMTP:[log in to unmask]]
Sent:  Tuesday, January 06, 1998 7:36 AM
To:  [log in to unmask]
Subject:  Re: [HP3000-L] Cooperative Services

Jon Broz said in his original message:

>      Cooperative Services, both the developer's kit and
runtime license,
>      has been discontinued as of 1JAN97 with end of
support 1FEB98.  There
>      are no replacement products from HP, although the
discontinuance plan
>      did mention WRQ's PPL(Process-to-Process Link) as a
"comparable 3rd
>      party product".

WRQ discontinued PPL (a/k/a RSDK) about a year (or more) ago
as well.  There is no direct replacement for either.  Both
pieces of software allowed the use of TurboIMAGE DB Calls
within PC programs, albeit Cooperative Services was more
geared toward DOS and Windows 3.0 (not 3.1), thus showing
its age.  RSDK was a 16-bit middleware product that provided
for the DB Calls, as well as virtually all of the intrinsics
(at the time)... and also provided for your own custom
server, as well as the generic server...

Both will be missed... both products were released ahead of
their time, which is why they met their demise, I guess.

Joe

Joe Geiser - CSI Business Solutions, LLC
** Your Client-Server and Internetworking Specialists
140 Bristol-Oxford Valley Road, Suite 102
Langhorne, PA  19047-3083, USA
Phone: +1 215.945.8100   Fax: +1 215.943-8408
[log in to unmask]            http://www.csillc.com