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A general description is here.
R CMD INSTALL can install zipfiles as binary packages.
The outer frame/console for RGgui/Rterm mentions '(64-bit)' to make it easier to distinguish running copies of R.
The Korean translation of the RGgui menus has been corrected and restored. (Thanks to June Kim and Seung-ho Kang.)
Some (but not all) Korean users have been having problems with Korean translations of the RGgui menus. These had not been updated for a long time, and have now been removed.