For anyone working on areas that doesn't already know, we have the code create equipment that can only be used by certain races. Do limit which races can use an item, add the following flags to the extras for the object:
If you want to limit multiple races from using something, just use more than one of those flags. For example, you could create an item useable only by dwarfs by adding the following to the extra flags:
If you're using Alicia's builder program, you'll have to open up the area file in a text editor and add these flags by hand until he can add it into the program. Feel free to get in touch with me if you have trouble figuring out how to add info by hand...