R is a statistics and graphics toolkit. Its origin is the S language developed at Bell Laboratories. R provides a wide variety of statistics and graphics tools. R is available as no-cost, open source software under the terms of the Free Software Foundation's GNU General Public License. R is in wide use by many enterprises both public and private.

The statistics and graphics features of R are easily accessible from APL+Win using the □cse system function and the R.Net interface to R. R.NET is a .Net interface to the R toolkit. R.Net is composed of .Net assemblies which enable programs written using a .NET Framework programming language, e.g. C#, to collaborate with the R toolkit. R.Net is available as no-cost, open source software under the terms of its BSD license.

The APL+Win □cse system function is an interface to the APLNext C# Script Engine (CSE). Using the □cse system function, APL+Win can execute CSE scripts, employing the R.Net assemblies, to use the R toolkit.