in reply to Calling perl systems from other systems, e.g. R
Depending on the complexity of the interaction between R and Perl that you desire, R packages can include Perl scripts (subject to availability of Perl on the target machine, of course, e.g. gtools::read.xml, gtools::installXLSXsupport), or R itself can work as a server accepting commands from clients (e.g. Rserve).