Signals are occurrences within the ObjectServer that can be detected and acted upon. Signals are part of the automation subsystem.
An ObjectServer automatically raises system signals when certain changes in the system occur; for example, during system startup or a connection failure. You cannot create or modify these signals. You can attach triggers to system signals to create automatic responses to incidents in the ObjectServer.
User-defined signals are defined by you. You can use Netcool/OMNIbus Administrator to create your own user-defined signals.