Is the license an unlimited license?

Sorry for the dumb question but seems I couldn't find this one the website.
I have a few questions regarding the license:
1. If I purchase a license from here https://www.virtualhere.com/purchase, the license will be bond to one device, my question is, could the device by any platform, including windows/linux/ARM ?
2. After I purchase the license and activate the server, this server could share as much usb devices as possible, as long as the server support it right?
3. For example, on a linux server, I can see the maximum devices number I can share is 122, does this mean that, I could have 122 clients, and use these 122 devices at the same time(one client using one device only)?

Thank you very much