A number of years ago, I created a panel with a keypad in CVI for the test operator to enter serial numbers without having to use the keyboard using a mouse. Later the customer installed a touch screen monitor and my keypad panel worked without change.
Other words, CVI did not know or care if they were using a mouse or a touch screen, that is all handled by the operation system.
Create a panel with push buttons to look like the key pad that you want. Write the callback code to go with it, then the rest is up to the touch pad and the operating system.
