invoke Kmag on button click in QT

[prkhr4u]

I want to invoke Kmag inside my Qt4 application on the press of a button.How can i do this?

In fact,can i know how to invoke any application inside QT that we can invoke using terminal.
In terminal i just have to type

kmag

kmag

To copy to clipboard, switch view to plain text mode 

to invoke.It is a screen magnifier basically

P.S : using ubuntu 12.04