🚀 go-pugleaf

In article <BXFys1w163w@kasoft.UUCP> kea@kasoft.UUCP (Ken Anderson) writes:
  I am dealing with 2 clients who want to window-ize their
  applications. They both currently use Phar Lap's DOS extender
  and a suitable C compiler.

You're getting confused about three similar but unrelated issues.

Issue 1:
DOS Extenders are for using protected mode facilities under DOS;
DPMI is a spec for DOS Extenders to enable extended programs to
cooperate in the use of PM facilities and memory when running under
DOS multitasking systems like Windows.  If your clients want their
DOS apps to work using the DOS virtual machines provided by Windows,
you need only wait until Phar Lap comes out with a version of their
extender that interacts with DPMI as implemented in Windows 3.0.
The Rational Systems expander used by 1-2-3 already does this.

Issue 2:
WINMEM32.DLL is for using 32-bit code and data segments in WinApps
on 386 machines.  None of the compiler vendors has yet provided support
for this; you'll have to roll your own or wait until they do.  If your
clients want their programs to be WinApps, and they need the 32-bit
model, you'll have to get into this.  I haven't actually used this
facility yet, so I won't offer any opinions on which 32-bit compiler
to use.

Issue 3:
Do your clients actually need a 32-bit environment, or are they using
the Phar Lap environment primarily to use >640K memory?  If they need
the 32-bit environment, you need to decide about the issues above.  But
if they're just using lots of memory, the ordinary Windows environment
may be enough.