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来自「开放源码的编译器open watcom 1.6.0版的源代码」· ME 代码 · 共 28 行

This directory contains a number of Windows programming examples.

The code is designed to be compiled using either the WATCOM C16
or WATCOM C32 compiler.

If the file build.mif (found in this directory) contains:
	WIN386=1
then 32-bit examples will be built. If it contains:
	WIN386=0
then 16-bit examples will be built.

The 32-bit specific code is between the conditional statements
#ifdef __WINDOWS_386__
or 
#ifndef __WINDOWS_386__

There are some functions that are for the 32-bit environment
that are macroed away in the 16-bit environment:

AllocAlias16 - gets a 16-bit far pointer to some 32-bit memory
	       (just returns the pointer in 16-bit code)
	       
FreeAlias16  - releases the 16-bit far pointer obtained by AllocAlias16
	       (does nothing in 16-bit code)
	       
GetProc16    - gets a special 16-bit thunk that points at 32-bit callbacks
	       (just returns the callback address in 16-bit code)