How to link a domain to another domain?

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The review of this web host was started by bugboy on 2009-10-31 13:12:51:

Hello everyone,

I currently have a few websites hosted. One of them is a .NET.
I want to purchase the same domain again, but as a .COM.
How do I link the new .com to the older .net domain?

PS: I use cPanel.

Thanks.

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