It is a C++ programming lanugage compiler made by Microsoft. It is expensive to buy and I don't think they have a free trial version of it. If you are serious about learning to program in C++, use the GNU G++ compiler. It may have a high learning curve but it pasy off in the end, not to mention that it's free.
There is a torrent at suprnova containing the kof2k3 rom set and a mame plus emulator and it works great. I was just wondering if anyone could post the mame source for the driver. I am building a mame cabinet and kof2k3 would be a great addition.