Optional Readonlyboxbox::use(pkg[a, b]): attach only the symbols listed in the [...] bracket
Optional Readonlycharacterthe package argument is evaluated, not taken as a symbol (requireNamespace/loadNamespace/attachNamespace, unlike library)
Optional Readonlyfromimport::from(pkg, a, b): attach only the symbols named in the call
Optional ReadonlynamespacerequireNamespace("pkg") / loadNamespace("pkg"): load without attaching bare names
Controls how processLibrary brings a package into scope.