Can anyone help me out with keyboard shortcuts for the option "save as..." from the file menu?

Is this command application specific? Does it differ between OS X and OS 9.2? I use both and thus need to know both versions if there are two.

I read at that the shortcut for "save as..." in OS X is shift-command-S but when I try this with say a Microsoft WordX document open nothing happens, what am I missing here?

Thanks a bunch in advance for replies.....