Hit "Next" -> "Install" and after that "Finish" you won't need the DocFiles
Now you have to start the tool with admin rights (Windows Vista/7) -> It'll ask if you want to create the bla file - can't make a screenshot... Hit "Yes"
Then you have a little icon in your taskbar next to the clock "right click + choose Edit This Script"->
The file "AutoHotkey.ahk" appears opened in the Editor ->
Put the link.. "and never put the wrong link there ;P" in it, save the file (CTRL+S) or the usual way.
Icon in your taskbar next to the clock "right click + choose -> Reload This Script"-> every new url or copied what you would paste has to be "Reloaded"
Go into the GMC CHAT and klick into the writing field ->
Feel the magic by pressing CTRL+ALT+S
edit: it seems to be the only way because it works with "sendkeys" the test is typed by your "keyboard" for you