![Image](http://i.imgur.com/BWxOkYi.png)
It's a simple representation of a keyboard Numpad-block. The first row of the GUI represent 4 Tabs - the rows below represent the keypad. Therefore I do have 4*17 different buttons (17 on each tab).
I use this for my Window/Multimonitor-Management tool (WorkInProcess). The current tab you see is used for Window-Resizing. The functionality can be accessed via Button-click or via NumPad. It's invoked via doubleKeypress for example: #Numpad1-Numpad5 (#Numpad1 opens the GUI and selects Tab 1 - and Numpad5 the desired functionality)