object may be a module, module-group or system. Returns the root system object which contains the object. Note that this may be different from the parent-object of the object, since parent-object returns the object directly containing the object, but containing-system searches up the tree of parent-objects until it finds one with no parent object.
See defsystem.htm for general information on the Defsystem facility in Allegro CL.
The documentation is described in introduction.htm and the index is in index.htm.
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