In this context "update" means any change to the item's shape, data, size or modified count. The supplied routine is called with the following calling sequence:
TRIGGER (ID,STATUS)
where ID is the identifier of the item which has been altered and STATUS is as usual. Any bad status returned by the trigger routine will be passed back to the caller.
NBS__NILID NIL ID
NBS__NOTOWNER Caller does not own the noticeboard
NBS The Noticeboard System