EndNote Web is a cloud-based reference manager. It can be linked to EndNote desktop to allow you to work on your reference library even if you are away from your main computer. These references can then be synchronised with your EndNote desktop.
First you must register with EndNote Web. Since this is software which is supported by the University of Cambridge, registering using a University-networked computer is the fastest way to ensure easy registration. Go to http://www.myendnoteweb.com. You will need to use your University email address to sign up.