Personal REXX is a complete implementation of the REXX language for the three major Intel-based desktop platforms: OS/2, Windows (any current version), and DOS. Each of these is a separate implementation, though they have most of the REXX language processor code in common. On each platform, we have added a number of utilities and extensions that make many of the facilities of the platform available to REXX users.

In addition, there is a programming interface that allows the use of REXX as general-purpose embeddable macro language that enables any application which supports this interface to utilize REXX as its native scripting language. In OS/2 and Windows, this programming interface is the same as used by IBM's OS/2 REXX.