Dell KVM 2321DS - Manual (Page 103)

Using the Viewer 87
Exclusive Mode
Exclusive Mode allows you to have exclusive control of a Video session.
When in Exclusive Mode, no other user can share the session (except in
Stealth mode). If other users are sharing the session when you select
Exclusive Mode, you are warned that selecting Exclusive Mode will cause the
other users to become disconnected from the session.
NOTE: Only the Primary user can request an Exclusive session. If other users are
sharing at the time Exclusive Mode is requested, they are disconnected, regardless
of the Primary users access level.
To open a Video session in Exclusive mode:
In the Viewer, choose Tools - Exclusive Mode.