# Reviewing the List of Known Differences

In the installation TERR, you can find a list of known differences in function behavior between open-source R and TERR in the documentation.

## About this task

You can access the list of known differences from Spotfire Analyst.

## Procedure

1. From the menu, click Tools > TERR Tools.
2. Click Open TERR Language Reference.
   Note: The language reference is included in the installation. The links to the technical guides and readme files open these documents on the TIBCO documentation website for Spotfire Enterprise Runtime for R.
   A web browser launches and displays the landing page with links to the documentation for TERR.
3. In the resulting browser window, click the link titled Differences Between TERR and Open-Source R.

## Results

The resulting web page provides detailed information of known differences in function behavior between TERR and open-source R, sorted by their packages. (This list is compiled from like sections in the individual function help files.)