Invite to shared workspace by url

Hello

I would like to share my desktop, and then invite people to my sharing by sending them an url. The participants should then be able to use the Lync web app, to see my shared desktop. I guess the way to go, is start a conversation, share my desktop, and then fetch the conversation url somehow.

I have used this http://social.msdn.microsoft.com/Forums/office/en-US/779be5ea-f58a-4404-abee-57596d92d843/prgrammatically-send-lync-invitation-to-email-address?forum=communicatorsdk to get an url to a conversation, but the link requires the participant to have lync installed.

How would i go about doing this?

Thanks.