LabVIEW 6.1 can be used to 'capture' events like mouse down, mouse up, value changed, etc. with the new 'Event Structure'. This structure can be used to execute specific functions once the events are captured.
> Does labview have the function of "event-trigger"? >
I probably need some more information to know what you mean by an event-trigger. LV automatically does multitasking using OS threads if they are available. There are a number of synchronization functions in the palettes such as notifiers, semaphores, queues, and occurrences.
If you expand on your question I can give a better answer.