This is only a quick trick since my head hurts. Anyway if you open up the help window from Help > [App Name] Help you can move it around but it will be in front of the application window. This can be very annoying. Simply because you can’t really use both the help viewer and the application at the same time. There is a solution and as usual it is found in a Terminal command.
Open up Terminal and type the following into the command line. You can copy and paste if you fell especially lazy.
defaults write com.apple.helpviewer NormalWindow -bool true
Hit return and re-open any help window you have open. When you click on the main window the help window will move into the background. Very useful. You can quickly hide the window without it getting in the way.
If you want to reverse the effect instead of true in the line above change it to false. This will then change the effect back to normal. A simple little Terminal trick that can improve your usability on your Mac.
If you want to take your skills with Terminal a bit further I recommend you check out the Terminal Category on this site. If you fancy reading a book there is a couple on Amazon that I regularly see mentioned and recommend, O’reilly Unix Geeks and Unix Under the Hood both are designed for Mac OS X and take Terminal further.