invoke Kmag on button click in QT

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

Code:

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kmag

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to invoke.It is a screen magnifier basically

P.S : using ubuntu 12.04

QProcess

Cheers,
_

I didn't know about QProcess.
Thanks,I am able to implement it successfully