Hello,
It's not the CAS session itself that is session-scope or global scope, it's about the CAS tables created in that session.
Remember session-scope tables can only be seen by a single CAS session and are dropped from CAS when that session is terminated, while global-scope tables can be seen publicly and will not be dropped when the CAS session is terminated.
Tip and tricks to promote CAS tables from session-scope to global-scope
By Ryan Lolli on SAS Users October 26, 2017
https://blogs.sas.com/content/sgf/2017/10/26/tip-and-tricks-to-promote-cas-tables-from-session-scope...
BR, Koen