CURRENT points to the last dict entry.

HERE points to current write offset.

IP is the Interpreter Pointer

PARSEPTR holds routine address called on (parse)

C<* holds routine address called on C<. If the C<* override
at 0x08 is nonzero, this routine is called instead.

IN> is the current position in IN(, which is the input buffer.

IN(* is a pointer to the input buffer, allocated at runtime.

                                                        (cont.)