REXX/CICS includes the REXX File System (RFS), a high-level file system that is hierarchically structured and is similar to the Operating System/2* (OS/2*), Advanced Interactive Executive* (AIX*), and the VM Shared File systems. The RFS automatically provides each REXX user with a file system in which to store execs and data. There is a file list utility to facilitate working with this file system, the text editor supports editing members of this file system, and execs to be run are loaded from this file system. This file system is VSAM based for performance, security, and portability reasons.