How do I trick DNS?

I have a bunch of domains I updated the DNS on last night. Of course my ISP hasn't updated yet, so it is not pointing to the new location.

Isn't there a way in windows somewhere I can manually plug in that www.whatever.com is actually ns1.myserver.com or a nameserver IP?

I seem to remember a way to 'trick' my PC in the past - but I forgot how to do this...

Thanks...

 

 

 

 

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