ARES only. Executes <command> as <user> and sends results to the pipe <outs>. In most cases, <user> and <outs> should both be the UUID of the user. Remove the leading @ symbol from <command>. To execute a shell command, a device command, or to use an alias, put "exec " at the start of <command>, e.g. exec service status restart or exec say Hello, world!

For a complete list of supported commands, see the ARES command reference.

Not to be confused with the system-to-device message command, which is used to notify a device that the user wishes to send a custom message to it.