1. VP - IMPP Virtual Presence CoBrow Instant Message Persistent Presence Klaus H. Wolf Cyland AG / Ulm University wolf@cyland.com

2. VP-IMPP Virtual Presence The Web seems to be lifeless But there are people VP makes people visible Meeting people on the Web

3. VP-IMPP Function Users move through the web VP server computes virtual neighbors VP client displays neighbors

4. VP-IMPP VP Display VP client displays peers Welcome to www.full-volume.com! There are 13 users on these pages, take your time to check things out.

5. VP-IMPP VP Infrastructure Client based  VP clients supply information Server based  Document servers supply information  Installation of VP components Network based  ISP supplies VP data

6. VP-IMPP Federated Servers VP to cover a large part of the Web Multiple VP servers Virtual Presence across server borders

7. VP-IMPP Persistent Presence Users want to  know if you can be reached o (active homepage example)  know how to reach you  tell how they want to be reached  dynamically, automatically

8. VP-IMPP Presence System User Proxy  persistant access point  hide details Presence System ROW User

9. VP-IMPP Presence Information Caller GET online-state for kermit is online for IM and telephone im://aol.com/kermit SEND IM to kermit GET IM-address IM service @ AOL IM

10. VP-IMPP Presence Servers frog.com kermit.frog.com aol.com im://aol.com/frog/kermit im://frog.com/kermit im://kermit.frog.com/ client-server peer-peer

11. VP-IMPP VP & PP VP client shows information on virtual neighbors PP client shows information on buddies Information bits:  Name, icon  Online status, contact address  Location PP is a subset of VP

12. VP-IMPP Notes on IMPP Technical discussion  PIDF (XML or not)  PITP (TCP vs. UDP, WAP)  Addressing (URL vs. email)  Substrate (SMTP, HTTP, SIP)  Client-server vs. server backbone  Authentication, spamming Missing working de-facto standard

13. VP-IMPP IMPP status At least 2 months behind schedule IMPP drafts out Private proposals out IETF put IMPP to sleep (dormant)  Slow progress  Waiting for new ideas, new people  Stepping back and re-thinking  AD expect proposals by June 15 Danger: IMPP Forum

14. VP-IMPP Security Every message must be authenticated Public key authentication PKIX (IETF) signature verification