Description from the author:
"MAKEREXX is a utility that allows a REXX programmer to create a library of generic routines. Those routines are maintained in a subdirectory named 'XXX' and must have a file suffix of '.XXX'. The REXX code produced by MAKEREXX is placed in a subdirectory of '.CMD' and will have a suffix of either '.CMD' or '.ERX'. '.CMD' files are OS/2 REXX routines while the '.ERX' files are EPM editor REXX routines. Mainline REXX routines are maintained in a subdirectory named 'REX' and must have a file suffix of either '.REX' or '.EPM'. '.REX' routines will be expanded into '.CMD' routines while '.EPM' routines will be expanded into '.ERX' routines."