(class? x)
Returns #t iff x is an object of type class (widget class).
(find-class name-of-class)
Returns the widget class of the specified name (an object of type class). name-of-class is a string or a symbol.
(class-resources widget-class)
See XtGetResourceList. Returns the resource list of the specified widget class. Each element of the list is a list of three symbols - the resource name, the resource class, and the resource type.
(class-constraint-resources widget-class)
See XtGetConstraintRespourceList. Returns the list of constraint resources that are defined for the specified widget class. Each element of the list is a list of three symbols - the resource name, the resource class, and the resource type.
(class-sub-resources widget-class)
Returns the list of sub-resources (if there are any) of the specified widget class. See class-resources above.
(class-exists? name-of-class)
Returns #t iff a widget class of the given name exists
(i.e. has been loaded by means of load-widgets).
name-of-class is a string or a symbol.