how to capture strings in a webpage with lua

for example,
I use a function below to open a webpage

function openURL()
OpenBrowser('http://www.gammon.com.au/forum/';)
end

now questions:
1.What should I do if I want to get some words in that webpage?like "Gammon Forum"

2.Can I close the browser through lua instead of using my hand??

Have you seen this?

http://www.gammon.com.au/forum/bbshowpost.php?id=4935

You should be able to read a web page into a string.