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I noticed this when I was helping my sister with iChat. She closed her AIM buddy list window and was unsure where the command was to open it -- it's faster just to ask me than dig around, it seems. So my first response was hit Cmd-1 (I'm training her to use the keyboard), the shortcut for Window ยป AIM Buddy List, but it didn't work. So I discovered that on her machine it was Command-2, while on mine, it was Command-1. Through this, I discovered that it's possible to change the value without doing anything in System Preferences.