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What might be the considerations for building a real time screen sharing service (some where close to shared view or live meeting) on top of Windows Azure? Please share your thoughts.

For this, it is obvious that we've to create a custom TCP/IP server - to which clients can connect to and exchange (publish/retrieve) data real time, over a custom protocol on top of TCP/IP.

I think Azure supports TCP/IP only for the web role as of now, on port 80 and 443? Please share your thoughts.

A: 

Low latency is still a tough case for cloud computing providers (Azure being no exception). I think that's going to toughest part in the design. Then, since the Nov'09 release, worker roles can have entry points too (not sure about port limitations though).

Joannes Vermorel