)CS changes the current space to the global namespace nm.
If no nm is given, the system changes to the top level (Root) namespace. If nm is not the name of a global namespace, the system reports the error message Namespace does not exist.
name may be either a simple name or a compound name separated by '.', including one of the special names '#' (Root) or '##' (Parent).
)CS
#
)CS X
#.X
)CS Y.Z
#.X.Y.Z
)CS ##
#.X.Y
)CS #.UTIL
#.UTIL