setting visibilty properties,renaming attributes of a dimension

hi
Kindly help me with following MDX related queries:
1. How to set the visibilty property of an attribute of a dimension using MDX Query?
2. How to Rename an attribute of a dimension using MDX Quryand do we need to process the cube after renaming ?

Hi
In AS 2005 you can open your as db in visual studio and rename the attribute which will not require processing of cube.
Else you can even execute XMLA Alter script to the database.