An object of class "DLLInfoList" which is a list
  with an element corresponding to each DLL that is currently loaded in the
  session.  Each element is an object of class "DLLInfo" which
  has the following entries.
namethe abbreviated name.
  paththe fully qualified name of the loaded DLL.
  dynamicLookupa logical value indicating whether R uses only
    the registration information to resolve symbols or whether it
    searches the entire symbol table of the DLL.
  handlea reference to the C-level data structure that
    provides access to the contents of the DLL.
    This is an object of class "DLLHandle".
  Note that the class DLLInfo has a method for
  $ which can be used to resolve native symbols within that
  DLL.  Therefore, one must access the R-level elements described
  above using [[, e.g.\sspacex[["name"]] or x[["handle"]].