In reply to Michelle B..

Michelle,
when running in a grid environment, it is up to the grid software to decide where to start each session, assuming you have configured grid-launched workspace servers. Thus, there is a good chance that the workspace server sessions will end up on different nodes.
Whether the workspace servers are started on the same node or on different nodes, their WORK libraries are always different. That's why I suggest to read the other post linked at the end.
In this specific case, when using process flows in the visual programmer perspective, there is actually a "WORK-like" library that is automatically created by SAS Studio and shared across all the workspace servers (assuming you are using a shared filesystem). It is called WEBWORK and can be used to share data across sessions. SAS Studio will take care of deleting it when you log off, just like the regular WORK directory.