Rserve is a server which allows other programs to use the facilities of R via TCP/IP.
Since Rserve gets installed to system folders, you need to do the install as the root user.
# Become root. $ sudo su # Run R as root. $ R > install.packages("Rserve")
To launch as a daemon.
$ R CMD Rserve
To launch in debug mode.
$ R CMD Rserve.dbg