Where can I download a texas instrument style computer graphing calculator?

I once saw a classmate using a graphing calculator on his laptop that looked just like a texas instrument one. where do I download that?

Maybe these links will help.

http://download.cnet.com/1770-20_4-0.html?query=scientific+calculator&searchtype=downloads&tag=mncol;rbxcdl.2.a.1

http://www.microsoft.com/windowsmobile/en-us/totalaccess/columns/mobile-calculator.mspx

http://www.downloadsquad.com/2007/08/20/mobile-minute-goes-back-to-school-using-windows-mobile-on-camp

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