TT> DOS/4GW is a DOS extender that comes with Watcom C/C++. 
It's a cut-down version of DOS/4G from Rational Systems, which does support 
C/C++ compilers other than Watcom C++.  Rational Systems has a licencing deal 
with Watcom (and whoever owns them now -- Sybase?) that allows DOS/4GW to be 
shipped and used with Watcom C++; but it also sells the full DOS/4G extender 
as a separate product in its own right.
I know that Phar Lap's TNT DOS extender (which is another "full" product) is 
compatible with MetaWare High C++, Borland C++, and Watcom C++.  I should 
think that DOS/4G would have a similar wide range of support.
And if one is using Borland C++ 3.x, one option (if for some bizarre reason 
one *really* didn't want to upgrade to a later version of Borland C++ or to 
switch to Watcom C++) would be to find out whether Rational Systems will 
still supply DOS/16M, which was the 16-bit predecessor to DOS/4G, and whether 
it works with Borland C++ 3.x .
 ¯ JdeBP ®
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