Your purchased license seat can be used in full on one device at a time. The individual application licenses within one seat license cannot be split between devices simultaneously.
If you engage any Chaos application from your seat on one device, no other application license from the same seat can be used on another device at the same time. After you stop using the license on your first device, it will be available for use on another device.
For example, if you purchase an Arch Design Collection and you start using Enscape on one device, you will not be able to use Envision on another device until you stop using Enscape on the first device.