Where are the items in the system tray stored?
Where in the registry can I find the definitions of icons in the notification area? I want to start removing icons I hate, like Adobe Reader's etc.
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Notification icons are not kept in the registry. They are added dynamically, by programs that are running at that moment. In other words, you have to configure the programs themselves to stop polluting the notification area.
For future reference:
Icons in the notification area are displayed by programs running, usually in the background. Those programs are often started by Run entries in the registry.
In the HKey_Current_User and HKey_Local_Machine hives.