Final answer:
To control access to desktop systems connected to critical networks, organizations implement security measures such as user authentication and access control lists (ACLs).
Step-by-step explanation:
In order to control access to desktop systems connected to critical networks, organizations implement various security measures.
One common approach is to use user authentication mechanisms such as passwords or biometrics to verify the identity of individuals accessing the desktop systems.
Furthermore, access control lists (ACLs) can be employed to restrict which users or groups have permissions to access specific files or resources on the desktop systems connected to critical networks.