* 2R@ ( R: a,a -- a,a R: a,a )

fetch a double-cell value from the return-stack, that had been
previously been put there with 2>R - see R@ for single value.
This can partly be a two-cell LOCALS| value, without LOCALS-EXT
there are alos other useful words like 2R! R'@ R"@

FORTH/ANS core (dpANS.6.2.0415) compiling primitive