Both tools can be used by scripts or individuals to send ESP Workload Manager instructions.
Instructions sent using ESPmgr are Automation Framework Messages (AFM) that travel through the communication path established between an ESP Agent and ESP Workload Manager.
The commands sent through ESPlmi travel through the Workstation Server started task and are the same as those which you would use in Pagemode or Application procedures.
This Frequently Asked Question applies to all supported releases of ESP Workload Manager.