Add custom menu item to windows right click context menu ????

Hi everyone

Earlier today there was a thread with this Q in it but it wasnt ever resolved. What i want to do is add my own custom entry to the windows menu that pops up when you right click on an something in particular to the edit menu. So when you select some text no matter what app your in it has my custom menu option in it along with the usual copy and paste and what not.

Can this be done

If so how and where do i start ??

I think it can be done. Except that all applications do not have the same context menu. So for ie you have to add there and for office you have to add it there. and so on, but here is a start. I saw something on adding context menus there.
http://www.domaindlx.com/e_morcillo/

that link doesn't work.