You need to install the Citrix WorkSpace App (formerly Citrix Receiver) to use these services:

Choose APPS to use a wide range of course-specific software - CLICK For Info
Choose DESKTOPS to remote control a University PC in a specialist lab - available outside of teaching hours only - CLICK For Info

IMPORTANT - to use either service you need the Citrix Workspace App - use the links below to get it for your device (choose Citrix if you're on Windows)