[V8i MDL] Changing Workspace within MicroStation

Does anybody know if there anyway of changing the active workspace once you're in MicroStation ?

I've got an old initapps application that has replaced the standard MicroStation front end and a user has asked if it's possible to select a ucf or a pcf from within it.

I can see that mdlSystem_getWorkspaceList() can be used to get a list of available workspaces but can't see anyway that could then be used, or if the workspace can be changed once MicroStation is up and running.