Introduction to ARexx support in Directory Opus 5.
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The ARexx command set is very comprehensive and flexible. Almost complete
control of listers in name mode is offered, along with the ability to
launch functions and commands. You can add your own commands to Opus via
ARexx scripts which are loaded automatically - the commands appear
identical to the built-in functions. You can even replace the default
commands with your own.

There is also a powerful custom handler ability. This allows your ARexx
program to receive messages from Opus for a variety of user actions,
including lister and icon events. See the section on  Custom Handlers 
for more information.