He he,
No offense but, evidently, you have no idea of what you are doing my friend...
In order for you to do such a thing, u have to do one of these two:
1) Have an ActiveX control that will run on the user's machine through the web page.
2) Have some sort of software that will install on the client machine.
If you intend to launch a software from a link in your page, the only thing you will launch is whatever you have installed in your server, and it will run IN YOUR SERVER, not in the user's computers. I mean, just try to make sense out of it, how would you feel if I could invade your privacy freely by running applications in your computer without your consent, just cause u visit a web page?
Activex controls and software are installed only if you allow it, which controls who can access your computer through such components. It also depends on your browser settings, but then again, those are setup by you.
Good Luck