ESP Workload Automation

We currently use  ESP on the mainframe and have agents running on windows and unix hosts as well.  Does anyone know if the mainframe is required, as implied by the  product statement below, or if ESP can be hosted by a non-mainframe platform?  Specifically, can we move the  primary ESP server off of z/OS to a  unix host (Solaris 10 probably)  and make the mainframe a  client?     What is CA ESP Workload Automation?
It is a mainframe-hosted workload automation product designed to manage complex cross-platform workloads and dependencies enterprise-wide. Event-based capabilities mean every process can execute in real time. It includes workload prioritization, real-time alerting, simulation and dynamic critical path analysis.

D-Series would be the tool, with an ESP agent on the mainframe. It is the destributed engine for ESP.

During our convertion to ESP we were told that ESP can be hosted on either a UNIX or Windows as the primary and the mainframe would be an agent. I don't remember exactly how it is achieved but i do know it can be done.

CA Workload Automation R11.1 SP1 (formerly dSeries) is the tool indeed: it is the Windows/Unix/Linux equivalent of ESP and has a z/OS agent to run mainframe workload.

There is a new release called CA Workload Automation DE R11.3 (the DE stands for dSeries Edition) due 4Q11/1Q12 which uses the same agents as ESP, so no issues there - you can use your existing agents for both ESP & dSeries at the same time for during migration, and dSeries uses the same scheduling philosophy as ESP (Events, Calendars, Applications, Resources etc).