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RE: Apache...?
As megamuff says, all you have to do is go into your router and instruct it to forward all external requests on port 80 to your machines internal IP address (192.168.*.* usually).
In my case (I am using a very cheap £20 router - it works better than some of the £60+ router's ive seen) it's called "Virtual Server" which is under a 'NAT' submenu.
Once you have done that, external access will work.
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