From an AppleShare File Server, MacDraw II will allow more than one person to open the same file, at the same time. The first person who saves any changes to that file will not have a problem. The others that try to save changes to the same file will get a message saying "someone has saved changes to this file while you worked on it, save under different name or replace one on server."
MacDraw II is not sold or supported as a multi-user application nor does the license agreement include any reference to this product as a multi-user application.