On each restart of the app and every 'Refresh' the application checks your current share settings including looking for any new incoming share requests. Calendarised will also check for new or updated events belonging to friends. Using a Wifi or good 3G connection this process takes 1-2 seconds per friend.
Your calendar will always stay up to date with your online calendar inside facebook at each 'Refresh'
Your Calendarised calendar can also be viewed right inside facebook without leaving facebook at all at http://apps.facebook.com/calendarised or here at http://calendarised.com simply by logging in.
Buttons allow you to post any of your own events to your facebook timeline, and also wish friends Happy Birthday right from your own calendar without going in to facebook at all.
Remember that your Calendarised calendar is totally separate from your iPhone native calendar and is not designed to syncronise with the native calendar in any way.