Difference between cas vs non-cas programming

[webmasterpdx]

I know that if you check the CAS box when creating a new program it creates a different program structure. However, I've not been able to find any documentation describing the difference between a CAS and non-CAS program. Anyone got any links on this? I did find this one, but it only describes how to create a CAS program, but nothing about the difference....
https://h30434.www3.hp.com/t5/Calculator...-p/5726289