Remote Desktop Services allows multiple concurrent users to access Windows Server in order to provide application and data hosting services using Microsoft "Presentation Virtualization" technology.Remote Desktop uses Remote Desktop Services technology to allow a single session to run remotely. A user can connect to a Remote Desktop Session Host (RD Session Host) server (formerly known as a terminal server) by using Remote Desktop Connection (RDC) client software. The Remote Desktop Web Connection extends Remote Desktop Services technology to the web. With the User CAL, you purchase a CAL for every user who accesses the server to use services such as file storage or printing, regardless of the number of devices they use for that access. Purchasing a User CAL might make more sense if your company's employees need to have roaming access to the corporate network by using multiple devices, or from unknown devices, or if you simply have more devices than users in your organization. Extend your datacenter to Azure to maximize your investments and gain new hybrid capabilities. Elevate your security posture by protecting the data center, starting with the operating system. Enable the creation of cloud-native apps, and modernize traditional apps using containers and microservices. Evolve your datacenter infrastructure to achieve greater efficiency and security.