What is the difference between Comet Technology and SignalR - comet

I searched this very badly.... Can anybody please tell me, what is the exact difference between SignalR and Comet Technology... I know that Comet does the same Client-Server Communication as SignalR... It pushes the data to the Client just as SignalR, then what is the difference between the 2. Please help.
Thank you!!!
Shivanand Arur.

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[I read all the similar questions previously answered, but the answers seemed rather conflicting. Please do only respond if you are 100% certain of the answer to prevent further confusion ;-) Thank you!]
We are planning to create facebook apps for clients.
Is it possible to use the same sub-domain for all apps in a way that requires a basic SSL certificate for all apps, so that a basic SSL certificate would suffice? (making it much more time and cost efficient for us)
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