Question: Is there a possibility to connect a several vCenter-servers to one Connection-server?
Answer: yes, there is a possibility without any restrictions.
Question: what is a definition region for a one desktop pool of VMs: one ESXi-host, a one ESXi-cluster, one vCenter-сервер or a several vCenter-servers?
Answer: one ESXi cluster.
Question: is there a possibility to create a one desktop pool of VMs for: several specified ESXi-hosts in one cluster; a whole cluster; a vCenter-server with a several clusters or for several vCenter-servers with several clusters in each all in one Active Directory domain?
Answer: one Desktop Pool - for a one ESXi-cluster. A whole cluster.
PS: one vcenter server - one composer server.