Does CCleaner Network work on virtual hosts?
Yes. CCleaner Network is designed to work with virtual hosts. CCleaner Network treats virtual hosts the same way it treats real hosts. All virtualization software is supported: VMWare, VirtualPC, Amazon EC2, and so on.
Is licensing the same for virtual hosts?
Licensing also works the same way -- one license is required for each host, whether it's virtual or real.
What do you consider an Endpoint?
An Endpoint is any Windows machine that can have a CCleaner Network Agent installed on it. This includes desktops, virtual machines, physical, notebook, servers etc..