Interpretation:
Interpretation semantics for this word are undefined.
Execution:
(
x1 x2 -- )
( R: --
x1 x2 )
Transfer cell pair
x1 x2 to the return stack.
Semantically equivalent to
SWAP >R >R.
Rationale:
The primary advantage of 2>R is that it puts the top
stack entry on the top of the return stack. For instance, a
double-cell number may be transferred to the return stack and
still have the most significant cell accessible on the top of
the return stack.