contents                Returns or changes parcel contents
is.parcel               Checks whether an object is a parcel
refset                  Create a reference to a subset of an object
refset-package          Subsets with Reference Semantics
unwrap_as               Unwrap contents of a parcel into a new variable
wrap                    Wrap an expression and its environment into a
                        parcel.
wrapset                 Convenience function to create a parcel
                        containing a refset.
