Trying to get an understanding of JAVA by using the "Head First Java" book. I need to download the J2SE SDK software and am having a problem getting it to run. I think I've downloaded the right software, but then I have to execute it by keing in "% javac" at the cmd line and I get errors. The directions say to add an entry to the PATH envioronment variable that points to the /bin directory inside the main Java directory. Sorry for such a simple newbie question. I am running this on my Windows 2000 laptop.