Right mouse click on the !M icon in the system tray and choose 'Show server status' to open the server UI. Access the 'Performance' panel and look at the 'Use X11 vector graphics mode in virtual sessions' option.

Open the /usr/NX/etc/node.cfg file and look for the AgentX11VectorGraphics key.

When the user chooses 'Create a new virtual desktop', the server creates a new desktop, i.e. it starts the X server on the first available display. This desktop is listed in the session list and corresponds to the entry with the actual DISPLAY.

Status of the virtual desktop session is 'Connected', the session type is 'unix-xsession-default'

For example:

This virtual desktop entry in the session list corresponds to one nxnode process. You can see that by running this command:

Note that the nxnode process related to the user's connection is the process running with the -H option.

The nxnode process owned (in this example) by gdm is the node in charge of mirroring the physical display. This nxnode process is necessary to let users connect to the physical desktop of the host machine and it's not started when the machine is headless or the X server is not up and running.

TIP

If the user has created a new custom application 'console', session type in the server list is 'unix-console', if he/she has specified the application, it's 'unix-application'.

When the user disconnects from the virtual desktop, such desktop remains running. The NoMachine server updates its entry in the session list and changes status to 'Disconnected'.

For example:

TIPS
I	If the user logs out (i.e. terminates the session), the virtual desktop is terminated. Its entry will be removed from the session list and disappear from the 'nxserver --list' output. The session history will report such session as 'Finished'.
II	The same applies to custom sessions.

When the user chooses 'Create a new virtual desktop', the NoMachine server executes two operations:

For example:

These entries correspond to two nxnode processes: one is the display session itself, the other is the user's session connected to that display.

You can see the nxnode processes by running:

You can recognize the nxnode process of the user's connection because it is running with the -H option. The other nxnode process owned by 'nomachine' is the display session.

The nxnode process owned (in this example) by lightdm is the node in charge of mirroring the physical display. This nxnode process is necessary to let users connect to the physical desktop of the host machine and it's not started when the machine is headless or the X server is not up and running.

When the user disconnects from the virtual desktop, the NoMachine server updates its entries in the session list. The display session remains running and maintains status 'Disconnected'. The session entry related to the user's connection disappears from the output of 'nxserver --list' and it's status is changed to 'Finished' in the session history.

For example:

If the user logs out (i.e. terminates the session), both desktop and connection entries are removed from the session list and disappear from the 'nxserver --list' output. The session history will report such session as 'Finished'.

When the user reconnects the virtual desktop, NoMachine server updates its entries in the session list. Also in this case, the session list will show two entries: one for the display session (it's the unix-xsession-default session type, with status 'Disconnected'), and one for the reconnection (it's the shadow session type with status Connected).

For example:

Note that the reconnected session will have a different Session ID from the session originally connected when the virtual desktop was created. Additionally, it could also be reconnected on a different Display.