I searched through a couple of questions on the topic "What to use .NET's Windows Workflow for?", (like this and this) and they got me started in grasping the big picture.
But one of the posts mentioned this article, which mentions the term "Process server". More specifically, here's its quote:
It seems like the most obvious use of WF in projects so far is when you’re building a process server product.
I have been trying to find a clear definition of what a process server is, but did not succeed yet.
One will end up in browsing IBM's WebSphere Process Server, which offers a very short overview of it's purpose, among other links - but I could find no clear and precise definition for Process Server (wikipedia has none).
Could anyone help fill the gap?