1. 

After you start the VMware Horizon client, you must configure it with set desktop.ecmwf.int as the server.

If there is any dialogue box asking for a user and password for the Reading system (vdesk.ecmwf.int) just  (the older Reading-based VDI) just cancel it and click on "desktop.ecmwf.int".

2.

Once the server is selected you will be sent to the authentication screen, where you will have to use your HID (either the hardware token or the software one). If by any chance you have already done this in your current browser session (eg if you started the Horizon client before, or even if you used Teleport just before) then this step will not be required the TOTP (time-based one time password). 

3.

Once the initial authentication is established (either with a new or a pre-existing authentication) the browser will ask for your permission to run the "VMware Horizon Client". You must click Allow here 

4.

After clicking "Allow", you are directed to any already open VDI session, or to a login screen in case you don't have any. If your userid is not listed, click on the "Not Listed" option and type your ECMWF UNIX userid

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5.

In case you already have an open session you will see the "Lock" screen. You can press any key at this point and you will be directed to the "Unlock" screen. Here you can type your ECMWF UNIX password and you should be able to unlock it.

Please be aware that if you use a non-UK or US keyboard, any special characters in your password may be interpreted incorrectly. See Typing your password with different keyboard layouts - Linux Virtual Desktop VDI FAQ for some information about how to overcome this problem.

6.

Once the session is started, you can either use the Activities menu at the top left to open the menu and then also or use the search box to find applications. Be reminded that this Linux VDI will only have a small selection of software installed, as envisioned by the Bologna - End-user Compute and Interactive Access model. Most of the applications you will need are indeed installed in the Atos HPC and expected to be run from there with ecinteractive.

Most users will not need much more than a terminal and a browser at this point, even though the ecflow UI is also installed.

If this is the first time you access the system you may to check The initial setup of the Red Hat Linux VDI - Options to choose - Linux Virtual Desktop VDI FAQ