what does the trigger's mean?

[cdkiller]

SecuROM™ Trigger Functions allow game developers to program multiple and fully customisable authentication checks throughout the entire application, providing more effective copy control than conventional systems with only one check at program start. Sony DADC offers a user-friendly, web-based Trigger Function Toolkit that enables publishers to customise a unique security code for each title in order to prevent Internet piracy and reverse-engineering attempts.