Windows Server 2019 RDS Device CAL at a glance
Remote Desktop Services (RDS) is the Windows Server role that lets people work on a central server through a remote session, either on a full desktop or with individual programs published as RemoteApp. Microsoft licenses this access separately: every user or device connecting to an RD Session Host needs an RDS client access licence (CAL) in addition to the regular Windows Server CAL. This product is the per-device variant of the RDS CAL for the 2019 generation of Windows Server.
With the per-device model, the right to connect is attached to the client hardware rather than to a person. Every employee who signs in at a licensed terminal, thin client or workstation is covered, no matter how many colleagues share that seat during the day. The licences are installed on a Remote Desktop Licensing server, which assigns them to machines as they connect and records which machine holds which CAL.
How it is used in everyday work
A typical setting is a company that runs its line-of-business software, for example an ERP client or a warehouse management tool, on one or more session hosts. Staff at a reception desk, on a production floor or in a hospital ward start their thin client, open the remote connection and land in a prepared session with the applications they need. At the change of shift, the next person signs in at the same station without any additional licence being consumed.
For administrators, most of the work happens in the background. Once a new machine has connected, the licensing server assigns it a permanent CAL from the installed pool, and RD Licensing Manager shows which machines currently hold one. If a session host reports a licensing problem, the RD Licensing Diagnoser in Server Manager helps to find the cause, such as a mismatch between the configured licensing mode and the installed CAL type. Call centres, training rooms and branch offices with fixed workstations benefit most from this arrangement.
The functions that make a practical difference
The central advantage of the per-device model is that licence consumption follows hardware, which makes planning predictable wherever the number of seats is fixed but the number of people is not. Because the licensing server tracks and enforces per-device CALs, an administrator can check at any time how many are issued and how many remain available before new workstations go into service. The licence applies to session-based desktops as well as to RemoteApp programs, so the same CAL serves a complete remote desktop or a single published application.
The 2019 RDS CALs are also downward compatible: Microsoft permits them for connections to session hosts running Windows Server 2019 or Windows Server 2016, which helps during a phased migration. When a licensed machine is retired or replaced, RD Licensing Manager offers a revoke function for per-device CALs, within limits defined by Microsoft, so the licence returns to the pool for the new hardware.
Choosing the right edition
Within the 2019 generation, Microsoft offers RDS CALs per device and per user. The Device CAL suits environments where several people share the same machines, such as shift work, classrooms or front desks. The RDS User CAL is the better fit when individual employees connect from different endpoints, for example an office PC, a laptop and a home computer, because that licence follows the person instead of the hardware. RDS CALs for Windows Server 2022 and 2025 also exist and can serve 2019 session hosts, but they require a licensing server running the matching or a newer Windows Server version.
Practical limits worth knowing before you buy
An RDS CAL never replaces the Windows Server CAL: each connecting device or user still needs a regular Windows Server CAL, which is sold separately. The 2019 RDS CAL cannot be used for connections to session hosts running Windows Server 2022 or later. It must be installed on a Remote Desktop Licensing server running Windows Server 2019 or newer, because a 2016 licensing server cannot host it. The CAL is purely an access right, so the server licences and the configured RDS deployment must already be in place.
Common questions before ordering
Do I still need a Windows Server CAL?
Yes. The Windows Server CAL covers basic access to the server, while the RDS CAL adds the right to use remote desktop sessions. Both must be present for each connecting client.
Can I use the Windows Server 2019 RDS Device CAL with older session hosts?
Microsoft's compatibility rules allow 2019 RDS CALs on session hosts running Windows Server 2016 and 2019. The licensing server itself, however, has to run Windows Server 2019 or later.
Should I choose Device CALs or User CALs?
If machines are shared between people working in shifts, Device CALs usually require fewer licences. If each person works from several endpoints, User CALs tend to be more economical. The licensing mode configured in your deployment must match the CAL type you install.
Ordering Windows Server 2019 RDS Device CAL at Keys.discount
Every order is processed automatically, so you normally have everything you need within a few minutes of paying.
Delivery: Your product key and the official download link arrive by email.
Activation guarantee: If activation fails, we replace the key.
Sourcing: Licences come from audited distribution channels and are documented.
Setup help: Written step-by-step instructions accompany every delivery.
Support: Our team answers by chat, email and phone in several languages.
