[transfer] Ensuring NO downtime?!?

I have a friend who said this

If you really want no downtime, and have access to modify the DNS zones, you can set the TTL's on the zone files to 0 the day before the move. Then, when you make the move, don't change the DNS servers. Just have the old DNS servers point to the new IP addresses. This change will happen instantly. Then, you can switch it to the new DNS servers. If it takes 24 hours, it won't matter, since both the old and new DNS servers are pointing to the same IP addresses....
Well, I have to transfer my accounts from one server to another server and I don't really understand the TLD // DNS Zone things.

Can someone explain these to me?

Thanks,
Cricketman -------------------+ [transfer] Ensuring NO downtime?!?

 

 

 

 

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