2.9.3 Trigger FunctionsWhat is a Trigger Function?Create a Trigger FunctionActivate a Trigger FunctionExactly When Are Triggers Invoked?The TRIG_OPER and TRIG_RETC Variables and TRIG_LIST Working ListWhat Codes Are Passed in TRIG_OPER to the Trigger?How Many Entries Are Passed in the TRIG_LIST?Triggers - A Classic ExampleExamples of Trigger useTriggers - Restrictions and LimitationsTriggers - Some Do's and Don'ts