Windows on-screen keyboard

I have a JSP page with a button inside. When i click the button, windows on-screen keyboard will pop up.
How do I do it?
I've done research and I've found "Runtime.getRuntime().exec("osk");"
but where do I implement these line? do I put it in servlet? or at my jsp page?

<td><INPUT type="button" value="on screen keyboard" onclick="Runtime.getRuntime().exec("osk");"/>

?