NoMachine Free Edition, available for Windows, Linux and Mac lets you access the physical desktop remotely. Your desktop is at your finger tips as if it were in front of you rather than being on the other side of town, in the other room, or in another country. It allows one connection and is for individual use (home or office). If you are working on your local desktop (sitting in front of it) and have NoMachine installed, a colleague or friend can connect to it to collaborate on a document and so on, or interact with you. If you are connecting to your desktop remotely, you will not be able to have a friend connect at the same time. They will need NoMachine Free Edition installed on their computer or NoMachine Enterprise Client. In order to allow two or more users to connect to the physical desktop of your computer, consider installing NoMachine Enterprise Desktop on it. Check out the comparison here: https://www.nomachine.com/remote-access-for-everyone.

NoMachine Workstation, from the NoMachine Terminal Server family, is a product aimed at Linux users. Any of the products in the Terminal Server suite let yous run multiple Linux desktops concurrently on the Linux host where it is installed. These are called "NoMachine virtual desktops" or "virtual desktop sessions".

Comparing NoMachine for Linux and NoMachine Workstation for Linux

There are four main differences between the two products.

1) Support for SSH is not available in the free edition of NoMachine. SSH support is available in the Workstation.

2) The virtual desktop functionality is not available in the free NoMachine for Linux package. Workstation is designed for virtual desktops.

3) NoMachine Free Edition allows one connection to the remote host, Workstation allows 4 virtual desktops to run the on the host and an unlimited number of connectsion can access those 4 virtual desktops.

4) NoMachine Free Edition doesn't support connections via browser. Connections to the remote computer via browser are available in the Workstation.

As mentioned earlier, Workstation will allow you to run up to 4 virtual desktops (including custom sessions/single applications) on a Linux host. These virtual desktops are replicas of the operating system residing on the host e.g. Ubuntu. Each virtual desktop is separate from the physical OS, and each other. Any of the products from the Terminal Server range (e.g. Workstation or Terminal Server, https://www.nomachine.com/enterprise) allow to create virtual desktop sessions (with the exception of Enterprise Desktop).