Update: This article only applies to V8i products.
Many customised configurations use the _USTN_WORKSPACEROOT variable to redirect the application to a networked workspace. This is a brute force approach that requires everything in the C:\ProgramData\Bentley\MicroStation V8i (SELECTseries)\WorkSpace folder to be copied to the network including the ...\WorkSpace\System folder which will be identical on every machine. This is a waste of network bandwidth and has the potential for mismatches between files and application versions.
You could define variable _USTN_SYSTEMROOT to point the system folder back to your local computer, but a simpler approach, and logically the right way round, is to selectively point to the things you want on the network by instead using _USTN_SITE which will redirect to the network version of the ...\WorkSpace\Standards folder.
See ABD SS6 - QuickConfig and MicroStation - QuickConfig Standard for examples of this approach.