If you're willing to spend a couple hundred $ you can buy covers that you put over your screen that make them touch screens. If the computer isn't very old, older than xp old, then finding a program that accepts touch input shouldn't be to hard to find. It wouldn't be to hard just very costly.Alternatively check out this:https://www.instructables.com/id/How-to-make-a-tablet-pc-from-an-old-laptop/
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oh it's ok
Your going to need a touch screen for a start - Other than that you need suitable software that can read the touch screen input and convert to graphics.Isn't going to be easy.
Can you please tell any software for this ?