If you are interested in compiling for others, it is pretty easy to add their auth. codes. Simply have them run MQ2Auth.exe and give you the 2 lines from MQ2Auth0.h. Then all you have to do is add those two lines to your MQ2Auth0.h, and recompile. Once that is done, presto, it works on both computers. In short that is how siddin and such do it, just by adding the auth codes of other people to their file before recompiling.