When you create a global desktop entitlement, you can specify whether users can initiate separate desktop sessions from different client devices. The multiple sessions per user policy applies only to global desktop entitlements that contain floating desktop pools.
When you enable the multiple sessions per user policy, users that connect to the global entitlement from different client devices receive different desktop sessions. To reconnect to an existing desktop session, users must use the same device from which that session was initiated. If you do not enable this policy, users are always reconnected to their existing desktop sessions, regardless of the client device that they use.
If you enable the multiple sessions per user policy for a global entitlement, all of the desktop pools associated with the global entitlement must also support multiple users per session.