G'day, I've developed a Java application that uses JRI to make use of the ptw package: http://cran.r-project.org/web/packages/ptw/index.html On Linux (Ubuntu 10.04, R 2.10.1, JRI 0.5.0) it works fine. However, on Vista (R 2.12.0, JRI 0.5.0) when the application evaluates "library(ptw)" the following error occurs: Error in library(ptw) : object 'ptw' not found When I run R from the Vista command-line and issue the "library(ptw)" command there is no problem. If I copy the ptw package from my %USER_HOME%\Documents\R\win-library to %R_HOME%\library then the problem goes away. However, I don't want my users to have to do this, in fact, some might not have permission to do so. Therefore, how can I get JRI to invoke an R-Engine that has access to packages that the user has installed in their %USER_HOME%\Documents\R\win-library? Thanks, Chris.