For both local pools and clusters, "parsim" will create a temporary working folder for each worker. In local pools this is usually in the directory returned from ">>tempdir".
For local pools, dependent and attached files are added to the path of the workers but not typically copied to the worker's working directory. This is because all workers share the same file system thus meaning a copy for each worker is inefficient.
For external clusters, "parsim" will transfer the necessary files just once from the client to the remote cluster. Then it will either add the shared file location to each worker's path or create a copy of each file for each worker depending on the cluster.
View the article below for more information on how to see the workers file locations and example of where those might be on a local and external pool.
