ip nat inside source list 1 interface FastEthernet4 overload

I am looking over my running config on my router and see: ip nat inside source list 1 interface FastEthernet4 overload.  What does this mean?  

I have to admit that I used to know all the Cisco stuff but cannot remember it because it has been like 6 years since I was involved in computer networking and have just recently gotten back into it.  
aclaus225Asked:
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mrwalker15Connect With a Mentor Commented:
Correct. It is a NAT command.

You dont get error messages when you show running-configuration.
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mrwalker15Commented:
This command enables translation on the inside address using access-list 1. the overload command enables the router to use one global address to many internal address. Also known as PAT or Hide NAT.
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aclaus225Author Commented:
So, this is not actually like an error message, but a command that is on the router?  
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aclaus225Author Commented:
I realized this after I posted the question.  Thanks for your help.  
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