We are working with some physically disabled students using some software that doesn't work with multi-touch screens. On Win8 touch screens a large surface touch such as a palm or back of hand registers as multiple touches, but the software only responds to a single touch. Is there a registry setting that can be changed to adjust the numbers of touch-points that are recognized?

We don't want to disable it permanently as most software works with multiple points of touch. We would like to select the numbers of touch points that register. Ideally from a start screen link to an option to choose between 1, 2, 4 touch points. 

Hi,

Please configure calibrate settings for a test.

http://windows.microsoft.com/en-us/windows-8/touch-pen-settings-frequently-asked-questions