It's unlikely that under normal use you would ever need to flush the cache. TreeWalk constantly (and automatically) purges stale answers from the cache before they become unreliable, using normal DNS expiration times.

The flush of cache is a safety mechanism so that should a site unexpectedly and suddenly change its location (perhaps by moving their web host), then by emptying the cache TreeWalk is forced to immediately refresh the DNS data for the site location (when required).

The TreeWalk cache is separate from your browser cache. You should only use the TW tools provided when required. TreeWalk is specially designed to save the cache between reboots so that your computer will retain ready location answers for the sites you visit often. This speeds up your browsing considerably.

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