Using the API to determine when a changeset was delivere

Hi,
I'm using the jazz plain client to read the contents of a stream or workspace. I use the following API calls to get there:-

IWorkspaceManager.findWorkspacesByName
IWorkspaceManager.getWorkspaceConnection
IWorkspaceConnection.getComponents
IWorkspaceConnection.configuration
IConfiguration.childEntriesForRoot

Once I work through the heirachy I end up with a load of IFolder and IFileItem.

From IFileItem/IFolder how can I find out the last changeset to modify that file and most importantly, in my case, when that changeset was delivered to my stream/workspace?

Cheers,

Michael Baylis
IBM Hursley