Here's a concrete problem:
I use Google Calendar and my coworker uses iCal. We need to be able to read (not write to) each others events.
I can share my different Google calendars with him by sending him the corresponding private URL, which he can then use to see my events.
However, I have not found a way to do the opposite - how can he share his calendar with me so I can see his events?
The only options I've found with Google, suggest either of us to move to either Google Calendar/iCal, which is not an option for other reasons.
Thanks in advance for any help!