Each Remote Agent uses one Client Access License (CAL), whether the Agent is paused (disabled) or active. Removing an agent releases the CAL back to the pool of licenses available. New agents cannot be provisioned more than the number of CALs licensed. That is, if you have 5 Remote Agent CALs, you can only create 5 Remote Agents. In trial mode, you can only define one Remote Agent.
The Remote Agents license status can be viewed in the EFT administration interface:
On the Status tab's Site node:
On the Server tab > Site node > General Tab:
And on the Server tab > Server node > General tab: