The ovm_vmmessage utility lets you send a message to a running virtual machine, or to query the value of a message sent from within a virtual machine to Oracle VM Manager via the Oracle VM API messaging interface. These values are basic key/value pairs such as foo=bar.

New Oracle VM templates released by Oracle will contain a configuration utility called ovmd. This utility is used to perform first-boot installation configuration either locally from the virtual machine console or remotely through the messaging interface provided by this utility. The ovmd utility also allows the owner of the virtual machine to send messages back to Oracle VM Manager. For more information about ovmd, and the Oracle VM Guest Additions in general, see Chapter 3, Using the Oracle VM Guest Additions.