Absolutely. I wrote a system to provide real time signature updates to Symantec's (then MessageLabs) global anti spam infrastructure. It used UDP to send them.

Absolutely. I wrote a system to provide real time signature updates to Symantec's (then MessageLabs) global anti spam infrastructure. It used UDP to send them. It worked amazingly well and distributed signatures across thousands of servers worldwide in milliseconds and if a packet got dropped oh well. It's about choosing the right tool for the job. Game servers use the same technique.