A:  If you have a DLL written in C++ like this:
 

#define  STRICT
#include <windows.h>
#define DEFINE_EXPORT
#define _EXP _export

//******Your code goes here*****************************************
int _EXP MyFunc (int i)
{
  return (i+10);
}
//*****************************************************************

#pragma argsused
int FAR PASCAL LibMain( HINSTANCE hInstance,
                        WORD wDataSegment,
                        WORD wHeapSize,
                        LPSTR lpszCmdLine )
{
    if ( wHeapSize != 0 )
         UnlockData( 0 );
    return 1;   // Indicate that the DLL was initialized successfully.
}

#pragma argsused
int FAR PASCAL WEP ( int bSystemExit )
{
    return 1;
}

This won't work.  There are two ways to fix it.   One is to declare the function in question as EXTERN.  e.g.

extern "C" {
int _EXP MyFunc (int i)
{
  return (i+10);
}
}

In this case you need to use cdelc when you prototype the function.  Something like this:

function MyFunc(i: integer): integer; cdecl; far; external 'MYDLL' index 12;

OR

you can declare the functions with FAR PASCAL and then call the function in the normal way

If there are problems, make sure that you declare the DLL functions with "_loadds".  Remember that, normally, a DLL function runs on the caller's DS, unless you specifically load the correct one.