The "Calc on TrackPad" is a calculator very easy to use. With this app you can make calculations very fast like in a real calculator or a numeric keypad, using the trackpad.
The TrackPad will emulate a numpad, then your mouse pointer will be locked and all the trackpad touches will be interpreted as calculator instructions.
Think about your TrackPad as a numpad. Tap and slide fingers to perform operations very easy and quickly.
To use this application, you need to have a device with TrackPad.