search for: _download

...Q (5.2 How can add-on packages be installed?), rw-FAQ, and help pages for Sys.setenv {base}, download.packages {utils}, etc.,. I am looking for something similar to the download.packages destdir argument on a global environment level, e.g., destdir <- 'C:/Program Files/_dave/stats/R/library/_download' in Rprofile.site. Any suggestions? Also, in a more general context, is there a way of listing all available (or common, or default, or standard, . . .) environment variables? I would like to know if there is an existing convention for any arbitrary process that I may try to do without reinven...