hi, Thanks for the code. I tried opening a pipe to the R.exe program, and then attempted to write to it using: my $program = "C:\\Program\ Files\\R\\R-2.7.1\\bin\\R.exe"; open my $x, "|-", "$program" or die "Can't launch R: $!"; $your_data="hello"; print $x $your_data; I obtained an error: Fatal error: you must specify '--save', '--no-save' or '--vanilla' I also tried the above code replacing the R.exe with the Rgui.exe. Although I didn't receive an error, I didn't obtain the output to the Rgui window. Further, using this option, perl doesn't continue past the point where the program is called (this is probably why I receive no error). I would like to be able to call the program, send some commands to it, obtain its output and then terminate the program. Could you please suggest where I can modify my code to make this work? Thanks! Al