The PowerMAC version of PREPRO2007 comes with OSX executables codes, in compressed form. 1) To uncompress and install, copy PREPROZ.sit to your hard drive, and then use Stuffit Expander on PREPROZ.sit. After installation you can delete PREPROZ.sit. 2) To VERIFY proper installation, it is recommended that after installation you execute the codes in the order shown in the file named VERIFY (this is a batch file, that on other types of computers will run the codes in sequence; on your PowerMAC you will have to do this manually). The final two codes will display the calculated cross sections (EVALPLOT), and compare the results you calculated to a standard set of results (COMPLOT). Difference of about 1 % are acceptable; larger differences indicate an installation problem. Using COMPLOT and EVALPLOT on-screen graphics --------------------------------------------- These codes use X11 graphics - so to executable them you need to run X11, which comes with OSX - you should, a) Open an X11 window. b) CD down to the directory containing the code. c) Execute, e.g., ./complot d) On exit close the X11 window e) Use (Alt-Apple-ESC) to exit X11 system. 3) If you have any problems notify the Nuclear Data Section, IAEA, Vienna, Austria. services@iaeand.iaea.or.at