* INTO ( [name] -- pfa )

will return the parameter-field address of the following word.
Unlike others, this word will also return the address of
LOCALS| and local LVALUE - so in fact a TO A and
INTO A ! are the same. This word is most useful when calling
C-exported function with a temporary local-VAR as a return-place
argument - so the address of a local has to be given as an arg.
Beware that you should not try to save the address anywhere else,
since a local's address does always depend of the RP-depth -
EXIT from a colon-word and the value may soon get overwritten.
(see also TO )

your compiling primitive