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Use your laptop (Windows, Linux, Mac) and open a browser to https://remote.campus.leidenuniv.nl/Citrix/XenApp/auth/login.aspx , or http://www.leidenuniv.nl → Medewerkers → Remote Werkplek. You may find that you have to install the Citrix Receiver (a INSTALL button will appear). Just follow the instructions, finish the installation and you should get the Remote Werkplek Login Screen.