Where Is My DNS Cache And How Do I Clear It?

I'm using Timbuktu to reach my desktop iMac remotely. I subscribe to DYNDNS to detect IP changes. Recently, after a blackout, I could not reach the iMac remotely via DYNDNS. I WAS able to use the new IP (which I had someone look up for me) and Timbuktu connected just fine.
After contacting DYNDNS, they told me to clear my DNS cache, as that was probably the reason why their detecting system could not see the new IP.
My head is spinning. Can some kindly tell me where the DNS cache is on my iMac 10.4.11 and how to clear it? (For idiots, please).
Many thanks
---Gary

Yes, it's clear. Thanks.
I'm just too nervous to try this until my Mac Guru is sitting here. I can't unscramble anything I screw up...and that's a pretty good possibility based on past events.
Again, thanks
Gary

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Where Is My DNS Cache And How Do I Clear It?

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