Use Case: Samantha Daryn is a speaker for a conference.  There are several calendar events as a speaker such as deadlines for submitting the presentation files and a special presenters-only meet and greet at the conference.  The conference site has a link where we can subscribe to these events.  When she clicks on it, her Lotus Notes client launches presents her with the "Add a Calendar" dialog box.  Samantha accepts the defaults and just clicks "Ok".  The events are automatically added to her calendar, and are automatically updated if they change.

 

Implementation: There is already a "webcal://" URI protocol in use on the web.  Lotus Notes just needs to register itself as a recipient, which should open the user's calendar and bring up the dialog box to add a calendar with the URL correctly filled in.