If you have a concealed carry permit then it is your responsibility to keep up on the laws. When you go to take the class the instructor will most likely inform you of this and will tell you where to find the information. Its not something that is ignored. One website in particular is handgunlaw.us , it shows the individual states and their reciprocity with other states. NY does not honor Indiana's permits and as stated above, you still couldnt carry in NYC if they did. Its really common knowledge among friearms enthusiasts and carry permit holders.