This article applies to NX Server 3.5.0. For more information about how to terminate or disconnect a virtual sessions with NoMachine 4 please refer to: https://www.nomachine.com/AR0100585

In a 3.5.0 virtual session, when the mouse pointer hovers over the title bar of a rootless session window, three small buttons appear in a dialog, it's the so called pull-down menu.

The left button disconnects (suspends) the session, the middle button terminates the session, the right button closes the window.

When you have only one window in the NX session, closing that window is equivalent to terminating the session.

The pull-down menu can be disabled by editing the EnablePulldownMenu key in the NX Server (v. 3.5.0) configuration file.