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replaced http://superuser.com/ with https://superuser.com/

I have added this question to get us started:

#What is Port Forwarding and what is it used for?

There are a lot of questions on 'port forwarding' but there doesn't seem to be one that cleary states what it is and what it's used for. So:

  1. What is Port Forwarding?
  1. What is it used for, and why would I need it?

I think that we still need an overview of how to set one up as well. (also if it hasn't been done, will a mod please make it CW)

James Mertz
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