NetWare volumes, by default, support the DOS name space, which means that the volume supports DOS file naming conventions (8 character filenames followed by an optional 3 character extension, with certain characters disallowed in filenames).
When a NetWare volume is set up for access by another non-NetWare system, an administrator may add additional name space support to a volume so that the non-NetWare system users can use filenames that make sense for their environment.
UnixWare users, for example, may require NFS® name space support for long filenames on a volume so that they don't need to rename their UnixWare files before copying them to a NetWare volume. (This is because UnixWare's name space allows unlimited length filenames with different allowable characters.)