Selecting which calendar to use with tell command...

I am connected to several Exchange calendars and there does not seem to be a way to present a list that I can then pick from that returns a specific calendar and a unique id to reference said calendar. I tried UID in the tell, but that failed. I would like to be able to connect to the calendar hosted on my office exchange server and add events to it. I just don’t see how to do that pragmatically as it and the other exchange server and the default mac calendar are all named “Calendar” and it seems to default to the local “Calendar”. Maybe I am going about this the wrong way, but from the Dictionary of iCal, it doesn’t seem like you can specify server?
Thanks
sorry for the noob question.
Rob

Welcome!

tell application "iCal"
	get id of every calendar
	get name of every calendar
	tell calendar id "FB2742DD-CE25-4F19-B528-254E93A192AD-1674-00000149C66AC7F8"
		get todo 1
	end tell
end tell

What, more exactly, is your problem?