clientSize in Toolbook 10.

Hi Clifton or anyone else if you can help,
I'm helping someone who has a more recent version of Toolbook than mine. In my version clientSize of viewer is in page units. Does clientSize still exist in Toolbook 10 + and if so are the dimensions now in pixels?
Many thanks
John
I'm helping someone who has a more recent version of Toolbook than mine. In my version clientSize of viewer is in page units. Does clientSize still exist in Toolbook 10 + and if so are the dimensions now in pixels?
Many thanks
John