Information in widget structure (General Design Notes on the Motif Toolkit Interface)

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integer ID for identifying the widget to the C server
widget class keyword (e.g. :FORM, :PUSH-BUTTON-GADGET, :UNKNOWN)
parent widget
list of (known) children
USER-DATA slot for programmer use
list of active callback lists
list of active protocol lists
list of active event handlers

The last three are for internal use in cleaning up Lisp state on widget destruction