That's true you can install only a single instance of Deployment
Agent (and why would you need more?), but what's the most exciting
you can use the same "access key" for multiple environments. If you
open environment settings you'll see its "access key" field is
editable - just copy key from one environment to another and you'll
target the same deployment agent.
But can you target multiple agents with the same key? Use case: a cluster. If I have boxes called WEB01 and WEB02, can I set up the agents on each machine to use the same key so that I can deploy to the "environment" and have it upload to both machines?
Yes, absolutely you can, you scenario works for many
By the way in next few days we will release new settings for you to
set number of remote agents you expect to pick up deployment job.
Deployment will fail if less than expected number of agents picked
it up, therefore you will be aware of inconsistent deployment if