Tracing Workflow

Hi,

I m new to workflow. Here wen employee sends a leave request or anything from portal side, how to identify which workflow is triggered for wihch service.

How to trace a perticualr employees events.

If employee faces problem in prd, how to check at PRD.

Its very simple question, but i m new to the WF.

Kindly let me know.

Regards,

Venkat