This is to quickly flush the DNS catche on your computer via command prompt (cmd-easy search for vista users). When you open up cmd make sure you are running it as an administratior and type the following in exactly as is!:

ipconfig /flushdns

You will see right below that (after you pres enter after that code) it will say something like it's completed. Now re-start your internet browser and delete all internet files cookies etc. etc. and then re-start again. You have now flushed your dns cache!

Thanks,
Mike

What does flushing the DNS cathe do?

When you type in an address, it has no cache to go on, so it fetches a brand new answer, so its definitely up to date.

Doesn't mean it's not poisoned, by spyware or the reccent thingy about normal DNS servers.

This is generally pointless, OpenDNS is a more complete solution.

I think this is good if you are troubleshooting computers that are displaying pop-ups to remove all traces of the internet threat. Some web hosting sites also recommend you flush the your DNS on your machine you access/update your site from when they are changing the ip address of a server of a domain hosting servers.

It is not really necessary but it is an option every troubleshooter should be aware of. This applies to all browsers.