NoMachine Cloud Server provides a single entry-point to multi-level server infrastructures. The servers sitting behind Cloud Server are called child servers. These child servers can be any of the NoMachine for the Enterprise range: Enterprise Desktop, Workstation, Small Business Servers, Terminal Server, Enterprise Terminal Server and even another Cloud Server to which you will add its own child servers.

It is not possible to add computers with the free NoMachine package installed.

Additionally, Foreign X Servers can be added to a Cloud Server. These are servers such as Unix-like workstations or servers with an X Window System e.g. Solaris, HP-UX, AIX, BSD systems for which there is no NoMachine package available.

For guidance on how to add servers to Cloud Server and FAQs, please see this article:
https://www.nomachine.com/AR05R01090

and this tutorial if you prefer to add servers via User Interface:
https://www.nomachine.com/adding-servers-to-nomachine-cloud-server-via-the-user-interface