-- depends on the types of attached regions and whether \var{reg}
-- implements \code{attach_framed} and \code{attach}. If \var{param}
-- is not set, the default of \verb!{switchto=true}! is used.
-- depends on the types of attached regions and whether \var{reg}
-- implements \code{attach_framed} and \code{attach}. If \var{param}
-- is not set, the default of \verb!{switchto=true}! is used.