There is no Print Window command in OS X. A couple wasy to do it. I use Print Window, a free program you can get at http://www.versiontracker.com. I keep it's icon in the Dock, if I want to print a window, I just drop the folder on that icon. You can use BBEdit. Open a new doc and drag the window to it.
I believe there is also a Terminal way, but I can't think of it now.
You can also just drag the folder/window to the printer icon (if you have that in your dock or as a alias). The printed result is not as nice as the old OS 9 Print Window though.