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Rules for Tools/SystemGadgets()

SYNOPSIS
     SystemGadgets(struct window *window, long class,
                   struct Gadget *gadget, long code)

DESCRIPTION
     To handle the system gadgets, the library has a routine,
     `SystemGadgets()', that you call every time you receive an
     intuition message.  Pass it the window, `message->Class', gadget
     pointer (if the message points to one,) and `message->Code'.

     It will process the message and return a new Class value, usually
     unchanged if this was not a system gadget call.  You can then
     procede as appropriate.