Control‑O can issue messages and commands on other systems, and it can respond to messages and commands from other systems.

Particular responses to messages can depend on the system or console that issued the message.

For systems linked by IOAGATE, such as using VTAM, and so on:

Control‑O directs actions to be performed on other systems using the SYSTEM subparameter or by the %%$COMMSYS system variable in the following IOAGATE-supported statements:

• DO COMMAND
• DO COND
• DO DISPLAY
• DO FORCEJOB
• DO RESOURCE
• DO RULE
• DO SHOUT