How does ical/zulu/google calendar make changes in the db?

Hello,
Can you tell me how changes are made to the FM database by zulu/ical.google calendar?
I would like to use a script trigger on one or 2 of the fields that are changed when changes are made in calendars. (eg event name and start date and end date fields)
IE onobjectEnter won't work but on objectModify might if 'insert text' is used, but not if 'replace field contents' is used...
Any clarification would be great!
Thanks
Guy
Can you tell me how changes are made to the FM database by zulu/ical.google calendar?
I would like to use a script trigger on one or 2 of the fields that are changed when changes are made in calendars. (eg event name and start date and end date fields)
IE onobjectEnter won't work but on objectModify might if 'insert text' is used, but not if 'replace field contents' is used...
Any clarification would be great!
Thanks
Guy