[Edit] It's apprently impossible to post encoded HTML here.

Just make a normal HTML link, it'll open a new browser window.

That's it, if you're asking for the actual text parsing, that's another story. Linking to an external website doesn't require Topic().

First you'd have to do some findtext() to figure out where everything was, findtext("people:") is a start, then you need to find where it finishes using findtext(" ",value_returned_from_first_findtext), THEN you need to find the key name using findtext(":",value_returned_from_first,value_returned_from_s econd)
Then you need to use copytext() with the values you obtained to root out the keyname, then you need to replace the people:keyname with the proper linked version.

edit: hurrm, no

 tags =(

proc/replacetext(string, find, replace)
var/found = findtext(string, find)if(!found)
return string
return copytext(string, 1, found) + replace + replacetext(copytext(string, found + lentext(replace)), find, replace)

proc/test(string, word, link)
var/found = findtext(string, word)

if(found)
var/space = findtext(string, " ", found)
var/value = copytext(string, found + lentext(word), space)

return replacetext(string, "[word][value]", "a href=[link][value]>[word][value]</a")