( -- c-addr
is the address of a transient region that can
be used to hold data for intermediate processing.
PAD has been available as scratch storage for strings
since the earliest Forth implementations. It was brought to
our attention that many programmers are reluctant to use
PAD, fearing incompatibilities with system uses.
PAD is specifically intended as a programmer convenience,
however, which is why we documented the fact that no standard
words use it.