This is a great tool that will help run Warcraft 3 on multiple instances
Have you ever thought of running multiple Warcraft 3's on a single PC? Now you can do it using kLoader. It's a tiny piece of program which allows you to run multiple instances of Warcraft 3 on a single computer without any such problems.
You can play 1v1 against yourself, watch multiple replays at same time or check the maps etc.