NOTE: CONSIDER USING library(tcltk);tcl("registry", ...) INSTEAD. Supports query, create, modify and delete on nodes and values via overloaded R list indexing/assignment operators. Does automatic registry <--> R type conversion.
If you love the Windows registry, you'll like hkey.
> library(hkey) > hkey() Win32 registry node: HKEY_LOCAL_MACHINE Use names() to list subkeys and data, $, [], [[]] to extract them. > names(hkey()) [1] "HARDWARE/" "SAM/" "SECURITY/" "SOFTWARE/" "SYSTEM/" > x <- hkey("HKEY_LOCAL_MACHINE/SOFTWARE") > names(x) [1] "781/" "Adi/" [3] "Adobe/" "Agere/" [5] "Ahead/" "Alps/" [7] "ALPS Electric Co., Ltd./" "Analog Devices/" [9] "Andrea Electronics/" "Ariad/" ... [47] "Skype/" "Staccato/" [49] "Sun Microsystems/" "TOSHIBA/" [51] "Wilson WindowWare/" "Windows/" [53] "Windows 3.1 Migration Status/" "Wireless/" > x <- x$"R-core" > names(x) [1] "R/" > x <- x[["R"]] > x[] $`2.2.1` Win32 registry node: HKEY_LOCAL_MACHINE/SOFTWARE/R-core/R/2.2.1 Use names() to list subkeys and data, $, [], [[]] to extract them. ... $`2.4.1` Win32 registry node: HKEY_LOCAL_MACHINE/SOFTWARE/R-core/R/2.4.1 Use names() to list subkeys and data, $, [], [[]] to extract them. $`Current Version` [1] "2.4.1" attr(,"class") [1] "REG_SZ" $InstallPath [1] "C:\\Program Files\\R\\R-2.4.1" attr(,"class") [1] "REG_SZ" > as.list(x) $`2.2.1` $`2.2.1`$InstallPath [1] "C:\\Program Files\\R\\R-2.2.1" ... $`2.4.1` $`2.4.1`$InstallPath [1] "C:\\Program Files\\R\\R-2.4.1" $`Current Version` [1] "2.4.1" $InstallPath [1] "C:\\Program Files\\R\\R-2.4.1" > x$new.value <- "This will be ignored by R, I hope" > x$new.subnode <- list(a=12345, b=c("one","more","time"), d=as.raw(10:1), e=list(nesting=c(2,2))) > as.list(x) $`2.2.1` $`2.2.1`$InstallPath [1] "C:\\Program Files\\R\\R-2.2.1" ... $new.subnode $new.subnode$e $new.subnode$e$nesting [1] 2 2 $new.subnode$a [1] 12345 $new.subnode$b [1] "time" "" "" $new.subnode$d [1] 0a 09 08 07 06 05 04 03 02 01 $`Current Version` [1] "2.4.1" $InstallPath [1] "C:\\Program Files\\R\\R-2.4.1" $new.value [1] "This will be ignored by R, I hope" > x[c("new.value", "new.subnode")] <- list(NULL, NULL) > names(x) [1] "2.2.1/" "2.3.0/" "2.3.1/" "2.4.0/" "2.4.1/" [7] "Current Version" "InstallPath"
The project summary page you can find here.