The most vital role REXX plays is as a programming language for OS/2. A REXX program can serve as a script for the OS/2 operating system to follow. Using REXX, you can reduce long, complex, or repetitious tasks to a single command or program.
REXX is a built-in feature of OS/2, so programs are run directly from a windowed or full-screen command prompt. There is no installation process or separate environment. You can run a REXX program anywhere that you can use an OS/2 command or batch file.