Only having start and end date as Filters for finding working instances is very limited..
If you don't know when an original WF was exactly started you need to supply very broad range to then start processing through the object list.
As part of workflows we set instances name to a unique reference, it would be much more useful to be able to search on that value...
Use case.. finding an already running workflow against a specific Document, that you don't know when it was launched, to be able to stop this workflow proceeding or stop/delete the previous instance.?
Thanks.