WordPress MU

Hello, i have a question , can i give the permission for write in all blog all the user of my wp mu (every user have already a blog).
There's a plugin, or a hack?

Thank you and sorry for my bad english :)

Yes

And how i can?

You understand the question? User A write article in the User B blog space.

Add user A to Blog B under the Users menu.

Thank you for the reply, i found the page, but... can i allow all user of my wp mu without insert one to one?

After the registration user can make the login to all blog like for example "administrator".

Or in alternative,
it's possibile have a unique pannel where user select the blog where send the article to pubblish?