Yes, touchscreens are supported by ClickShare devices: CSE-200(+), CSE-800, CX-30 and CX-50, see [KB7541].
Using your touch display to control your computer is supported - (UMT or called Touchback)
Blackboarding and annotation is supported by CSE-200+ and CSE-800, see [KB4998].
More details about the supported touch displays can be found in the ClickShare Supported Touch Panels whitepaper. This whitepaper can be found on the product page Technical Support > Manuals' Drawings & Documentation. A direct link to this whitepaper can be found at the bottom of this article.
Last updated Feb 03 2021