Get the cursor position

Hello Experts,

Can anyone please tell me how to identify the cursor position (Window co-ordinates).

My requirement is, when user click the button i need to show the popup screen near to the button.

And that button is dynamic i can be appear in anywhere.

So i planning to get the screen co-ordinates, while clicking the button and then adjust the pop-up screen based on that.

Please Help

Thanks & Regards,

Ashok