Orchestrator Query

I have doubts about Orchestrator licensing

  1. After installing orchestrator in our server, How many device can connect to orchestrator server at a time.
  2. If any process is running 24*7 but if any error occur at server side then how can we get the alert of this?
  3. If any process is working 24*7 on machine “A” so, can we used machine “A” at the same time to run other processes from studio.
  4. Can we run multiple robot at a same time on a same machine ?