home.md

@@ -1231,6 +1231,19 @@ vncserver -kill :1
 Killing Xvnc process ID 47947
 ```
 
+#### vncserver and port numbers
+Everytime someone start a vcnsession and there is already a vncsession running, the port number will increase.
+The first connection will be on **:1** which is port 5900 + 1, where the port 5900 is the standard port number for VNC.
+For example:
+```
+Desktop 'TurboVNC: res-hpc-gpu01.researchlumc.nl:3 (pybvanvliet)' started on display res-hpc-gpu01.researchlumc.nl:3
+```
+In this case, port to connect is number **3**.
+So you connect to "res-hpc-gpu01.researchlumc.nl:3".
+
+You can always list you own open vnc session with the "vncserver -list" command.
+Remember to kill you vnc session when you are done running your own application.
+
 ### connect from your remote desktop to the vcnserver
 If you are running the **X2Go** client, open a terminal.
 Then run the command: