Using windows on an IPad

No you can't. iOS and Windows are two completely different operating systems and iPad will never be able to run Windows. If you need a tablet which can run Windows, you should look at the Microsoft Surface.

You can't specifically run Windows on an iPad, but there is a way to remotely access a physical machine running Windows on an iPad.

https://www.parallels.com/products/access/

It is not possible.

Nope.