I believe that Rcmdr and RcmdrMisc are specifically intended for use in the R Commander GUI.
Rcmdr: R Commander
A platform-independent basic-statistics GUI (graphical user interface) for R, based on the tcltk package.
RcmdrMisc: R Commander Miscellaneous Functions
Various statistical, graphics, and data-management functions used by the Rcmdr package in the R Commander GUI for R.