There is an open-source effort:
> From: Eric Busboom <[EMAIL PROTECTED]>
> Date: Tue, 30 Mar 1999 11:29:33 -0800
>
> I have created a new mailing list for this effort:
>
> [EMAIL PROTECTED]
>
> You can subscribe to this list by sending this mail:
>
> To: [EMAIL PROTECTED]
> Subject: subscribe libical
>
> I will also announce this to the k-organizer list.
>
> -eric.
Neelima Kalidindi wrote:
>
> Hi All,
> I'm doing a research on the availability of client APIs that can
> access calendar information (using the iCal/vCal standard notations).
> Specifically, I'm looking for APIs that can query if a certain user or
> group of users is free at a given time or time range. I'd really
> appreciate it if someone could give me any help in this regard even if
> it
> means direction to some source where I might find such information.
>
> Thanks
> Neelima.